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Florida, Dec. 1-4, 1998, pp. 179-180.","npl_type":"a","external_id":["10.1109/leos.1998.739520"],"record_lens_id":"018-999-895-089-51X","lens_id":["076-978-777-842-09X","018-999-895-089-51X"],"sequence":106,"category":[],"us_category":[],"cited_phase":"APP","rel_claims":[]}},{"npl":{"num":8,"text":"Choquette et al., \"High Single Mode Operation from Hybrid Ion Implanted/Selectively Oxidized VCSELs\", 2000 IEEE 17th International Semicondutor Laser Conference; Monterrey, CA, pp. 59-60.","npl_type":"a","external_id":["10.1109/islc.2000.882287"],"record_lens_id":"140-725-721-342-807","lens_id":["192-525-616-310-862","140-725-721-342-807"],"sequence":107,"category":[],"us_category":[],"cited_phase":"APP","rel_claims":[]}},{"npl":{"num":9,"text":"Choquette et al., \"Lithographically-Defined Gain Apertures Within Selectively Oxidized VCSELs\", paper CtuL6, Conference on Lasers and Electro-Optics, San Francisco, California (2000).","npl_type":"a","external_id":["10.1109/cleo.2000.906953"],"record_lens_id":"136-019-664-474-99X","lens_id":["191-549-698-766-547","136-019-664-474-99X"],"sequence":108,"category":[],"us_category":[],"cited_phase":"APP","rel_claims":[]}},{"npl":{"num":10,"text":"Choquette, et al., \"VCSELs in information systems: 1OGbps-1 oxide VCSELs for data communication\", Optics In Information Systems, vol. 12, No. 1, p. 5, SPIE International Technical Group Newsletter, Apr. 2001.","npl_type":"a","external_id":[],"lens_id":[],"sequence":109,"category":[],"us_category":[],"cited_phase":"APP","rel_claims":[]}},{"npl":{"num":11,"text":"Chua, et al., \"Low-Threshold 1.57- mum VC-SEL's Using Strain-Compensated Quantum Wells and Oxide/Metal Backmirror,\" IEEE Photonics Technology Letters, vol. 7, No. 5, pp. 444-446, May 1995.","npl_type":"a","external_id":["10.1109/68.384504"],"record_lens_id":"126-038-913-502-965","lens_id":["184-933-667-055-905","126-038-913-502-965"],"sequence":110,"category":[],"us_category":[],"cited_phase":"APP","rel_claims":[]}},{"npl":{"num":12,"text":"Chua, et al, \"Planar Laterally Oxidized Vertical-Cavity Lasers for Low-Threshold High-Density Top-Surface-Emitting Arrays,\" IEEE Photonic Technology Letters, vol. 9, No. 8, pp. 1060-1062, Aug. 1997.","npl_type":"a","external_id":["10.1109/68.605499"],"record_lens_id":"167-302-296-002-048","lens_id":["187-500-123-923-378","167-302-296-002-048"],"sequence":111,"category":[],"us_category":[],"cited_phase":"APP","rel_claims":[]}},{"npl":{"num":13,"text":"Cox, J. 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The DBR may include a first mirror layer and a second mirror layer, with an interface therebetween. A step transition is provided in the aluminum concentration and in the doping concentration at or near the interface between the first mirror layer and the second mirror layer. To reduce optical absorption, the interface between the first and second mirror layers may be positioned at or near a null in the optical electric field within the DBR. A graded junction may also be provided. The graded junction may be more lightly doped, have a graded aluminum concentration, and may be placed at or near a peak in the optical electric field.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"}]},"abstract_lang":["en"],"has_abstract":true,"claim":{"en":[{"text":"1. A Distributed Bragg Reflector (DBR), comprising: a first mirror layer having a substantially uniform doping concentration; a second mirror layer positioned adjacent to the first mirror layer and the second mirror layer having an aluminum concentration that is higher than an aluminum concentration in the first mirror layer, wherein a transition from the aluminum concentration in the first mirror layer directly to the aluminum concentration in the second mirror layer takes the form of an upward step change in aluminum concentration that takes place entirely within the second mirror layer; and the second mirror layer having a doping concentration that is at or above 1E19atoms/cm 3 proximate the first mirror layer, and wherein a doping level change in the second mirror layer coincides substantially with the upward step change in aluminum concentration.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"2. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer includes a doping concentration, and the transition from the doping concentration in the first mirror layer to the doping concentration in the second mirror layer includes an upward step.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"3. A Distributed Bragg Reflector (DBR) according to claim 2 wherein the step in concentration between the aluminum concentration in the first mirror layer to the aluminum concentration in the second mirror layer and the step in doping concentration between any doping concentration in the first mirror layer to the doping concentration in the second mirror layer are coincident or substantially coincident.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"4. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer includes a doping concentration that is at or below about 6E18 atoms/cm 3 .","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"5. A Distributed Bragg Reflector (DBR) according to claim 4 wherein the doping concentration in the first mirror layer is at or below about 1E18 atoms/cm 3 .","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"6. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the doping concentration in the second mirror layer is at or above about 5E19 atoms/cm 3 proximate the first mirror layer.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"7. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer includes an aluminum concentration that is below about 40%, and the second mirror layer includes an aluminum concentration that is above about 60%.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"8. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the aluminum concentration of the first mirror layer is zero or substantially zero.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"9. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer is GaAs, and the second mirror layer is AlAs.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"10. A Distributed Bragg Reflector (DBR) according to claim 1 wherein, during use, the Distributed Bragg Reflector (DBR) has an optical electric field that is produced by resonant light, the optical electric field having a number of nulls and a number of peaks, wherein an interface between the first mirror layer and the second mirror layer is located at or near a null in the optical electric field.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"11. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer has an optical thickness of about ¼ lambda.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"12. A Distributed Bragg Reflector (DBR) according to claim 11 wherein the second mirror layer has an optical thickness of about ¼ lambda.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"13. A Distributed Bragg Reflector (DBR) according to claim 1 further comprises: a third mirror layer positioned adjacent to the first mirror layer such that the first mirror layer is between the third mirror layer and the second mirror layer, the third mirror layer having an aluminum concentration that is higher than the aluminum concentration in the first mirror layer, wherein the transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the third mirror layer includes a grade; the third mirror layer having a doping concentration that is below the doping concentration in the second mirror layer.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"14. A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer includes a doping concentration that is at or below about 6E18 atoms/cm 3 .","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"15. A Distributed Bragg Reflector (DBR) according to claim 14 wherein the third mirror layer includes a doping concentration that is at or below about 2E 18 atoms/cm 3 .","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"16. A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer includes a doping concentration that is substantially the same as the doping concentration of the first mirror layer.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"17. A Distributed Bragg Reflector (DBR) according to claim 13 wherein, during use, the Distributed Bragg Reflector (DBR) has an optical electric field that is produced by resonant light, the optical electric field having a number of nulls and a number of peaks, wherein the interface between the third mirror layer and the first mirror layer is located at or near a peak in the optical electric field.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"18. A Distributed Bragg Reflector (DBR) comprising: a graded interface having a graded aluminum concentration that changes from a first higher aluminum concentration to a first lower aluminum concentration, and further having a doping concentration; a stepped interface having a stepped aluminum concentration from a second lower aluminum concentration to a second higher aluminum concentration, and further having a stepped doping concentration from a lower doping concentration to a higher doping concentration that coincides substantially with the stepped aluminum concentration from a second lower aluminum concentration to a second higher aluminum concentration, wherein the stepped aluminum concentration and the stepped doping concentration both occur entirely within a common layer of the DBR, the common layer being adjacent to another DBR layer whose aluminum concentration is about zero, and wherein the higher doping concentration is at least five times that of the doping concentration of the graded interface and is at or above 1E19 atoms/cm 3 ; and the Distributed Bragg Reflector (DBR) having an optical electric field that is produced by resonant light, the optical electric field having a number of nulls and a number of peaks, wherein the graded interface is positioned at or near a peak in the optical electric field and the stepped interface is positioned at or near a null in the optical electric field.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"19. A Distributed Bragg Reflector (DBR) according to claim 18 wherein the higher doping concentration is at least ten times that of the doping concentration of the graded interface.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"20. A Distributed Bragg Reflector (DBR) according to claim 19 wherein the higher doping concentration is at least fifteen times that of the doping concentration of the graded interface.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"21. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer is substantially comprised of GaAs.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"22. A Distributed Bragg Reflector (DBR) according to claim 1 wherein an aluminum (Al) concentration in the first mirror layer is about zero.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"23. A Distributed Bragg Reflector (DBR) according to claim 1 wherein the second mirror layer substantially comprises AlAs.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"24. A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer substantially comprises AlAs.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"25. A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer includes a plurality of step changes in aluminum (Al) concentration.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"26. A Distributed Bragg Reflector (DBR), comprising: a first mirror layer having an aluminum concentration of about zero and having a substantially uniform doping concentration; a second mirror layer positioned adjacent to the first mirror layer and the second mirror layer having an aluminum concentration that is higher than an aluminum concentration in the first mirror layer, wherein a transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the second mirror layer includes an upward step change in aluminum concentration that takes place entirely within the second mirror layer; the second mirror layer having therein an upward step change in doping concentration, relative to a doping concentration of the first mirror layer, the upward step change in doping concentration of the second mirror layer occurring at substantially the same DBR position as a DBR position at which the upward step change in aluminum concentration occurs; and a third mirror layer positioned adjacent to the first mirror layer such that the first mirror layer is between the third mirror layer and the second mirror layer, the third mirror layer having an aluminum concentration that is higher than the aluminum concentration in the first mirror layer, wherein the transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the third mirror layer includes a grade, and the third mirror layer having a doping concentration that is below the doping concentration in the second mirror layer.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"27. A Distributed Bragg Reflector according to claim 26 wherein the DBR comprises an Al x Ga (1-x) As DBR.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"28. A Distributed Bragg Reflector according to claim 26 wherein: the first layer substantially comprises GaAs; and the second and third layers each substantially comprise AlAs.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"29. A Distributed Bragg Reflector according to claim 26 wherein the transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the second mirror layer includes one or more additional upward step changes in aluminum concentration.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"30. A Distributed Bragg Reflector according to claim 26 wherein a doping concentration in the first layer is substantially the same as a doping concentration in the third layer.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"},{"text":"31. A Distributed Bragg Reflector according to claim 26 wherein the doping concentration of the second mirror layer is stepped up from a doping concentration of the first layer in a single step.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"}]},"claim_lang":["en"],"has_claim":true,"description":{"en":{"text":"CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Application Ser. No. 60/605,737, filed Aug. 31, 2004. This application is related to U.S. patent application Ser. No. 10/283,381, filed on Oct. 28, 2002, entitled “Distributed Bragg Reflector for Optoelectronic Device”, and U.S. patent application Ser. No. 10/028,435, filed on Dec. 28, 2001, entitled “Asymmetric Distributed Bragg Reflector (DBRS) Suitable for Vertical-Cavity Surface-Emitting Lasers”. The foregoing applications are incorporated herein by reference. GOVERNMENT RIGHTS This invention was made with government support under NIST DATA PIPE contract number 70NAHB8H4023. The United States Government may have certain rights in the invention. BACKGROUND OF THE INVENTION 1. The Field of the Invention This invention relates to mirror structures, and more specifically, to mirror structures suitable for use in resonant cavity devices such as vertical cavity surface emitting lasers. 2. The Relevant Technology Vertical cavity surface emitting lasers (VCSELs) represent a relatively new class of semiconductor lasers. While there are many variations of VCSELs, one common characteristic is that they emit light perpendicular to a wafer's surface. Advantageously, VCSELs can be formed from a wide range of material systems to produce specific characteristics. In particular, the various material systems can be tailored to produce different laser wavelengths, such as 1550 nm, 1310 nm, 850 nm, 670 nm, and so on. FIG. 1 illustrates a conventional VCSEL device 10 . As shown, an n-doped gallium arsenide (GaAs) substrate 12 has an n-type electrical contact 14 . An n-doped lower mirror stack 16 (a DBR) is positioned on the GaAs substrate 12 , and an n-type lower spacer 18 is disposed over the lower mirror stack 16 . An active region 20 , usually having a number of quantum wells, is formed over the lower spacer 18 . A p-type top spacer 22 is then disposed over the active region 20 , and a p-type top mirror stack 24 (another DBR) is disposed over the top spacer 22 . Over the top mirror stack 24 is a p-type conduction layer 9 , a p-type GaAs cap layer 8 , and a p-type electrical contact 26 . Still referring to FIG. 1 , the lower spacer 18 and the top spacer 22 separate the lower mirror stack 16 from the top mirror stack 24 such that an optical cavity is formed. As the optical cavity is resonant at specific wavelengths, the mirror separation is controlled to resonate at a predetermined wavelength (or at a multiple thereof). As shown in FIG. 1 , at least part of the top mirror stack 24 may include an annular shaped region 40 that is doped to be non-conductive, typically with a deep H+ implant. The annular shaped region 40 as shown defines a conductive annular central opening 42 that provides an electrically conductive path above a desired region of the active region 20 . During operation, an external bias causes an electrical current 21 to flow from the p-type electrical contact 26 toward the n-type electrical contact 14 . The annular shaped region 40 , and more specifically, the conductive central opening 42 confine the current 21 such that it flows through the desired region of the active region 20 . Some of the carriers in the current 21 are converted into photons in the active region 20 . Those photons bounce back and forth (resonate) between the lower mirror stack 16 and the top mirror stack 24 . While the lower mirror stack 16 and the top mirror stack 24 are good reflectors, some of the photons escape out as light 23 . For top emitting devices, the top mirror 24 may be made slightly less reflective than the bottom mirror 16 to facilitate the escape of photons in an upward direction. After passing through the top mirror 24 , the light 23 passes through the p-type conduction layer 9 , through the p-type GaAs cap layer 8 , through an aperture 30 in the p-type electrical contact 26 , and out of the surface of the vertical cavity surface emitting laser 10 . It should be understood that FIG. 1 illustrates a typical VCSEL device, and that numerous variations are possible. For example, the dopings can be changed (say, by providing a p-type substrate 12 ), different material systems can be used, operational details can be tuned for maximum performance, and additional structures, such as tunnel junctions, can be added, if desired. Most VCSELs of practical dimensions are inherently multi (transverse) mode. Single lowest-order mode VCSELs are favored for coupling into single-mode fibers, and are advantageous for free-space and/or wavelength sensitive systems, and may even be beneficial for use in extending the bandwidth-length product of standard 50 μm and 62.5 μm GRIN multi-mode fiber. However, it has long been known that, although the short optical cavity (approximately 1λ) of the VCSEL favors single longitudinal mode emission, the multi-wavelength (approximately 10's of λ) lateral dimensions facilitate multi-transverse mode operation. Higher-order modes typically have a greater lateral concentration of energy away from the center of the lasing cavity. Thus, the one way to force the laser to oscillate in only a lowest-order circularly symmetric mode or a few lower order modes is to make the lateral dimension of the active area small enough to prevent higher-order modes from reaching threshold. However, this necessitates lateral dimensions of less than about 5 μm for typical VCSELs. Such small areas may result in excessive resistance and push the limits obtainable from conventional fabrication methodologies. For example, and referring to FIG. 1 , it is often difficult to control the deep H+ implant when forming the annular shaped current confining region 40 , particularly when the implantation depth is greater than about 1 μm, where lateral straggle may become a limiting factor. Thus, control of transverse modes remains difficult for VCSELs of practical dimensions. Rather than using a deep H+ implant to define an annular current confinement region 40 , some VCSELs use a high aluminum bearing layer in the top mirror to provide oxide current confinement. Typically, a mesa is formed by etching around the VCSEL device (as taught, for example, in U.S. Pat. No. 5,493,577), after which the high aluminum bearing layer is laterally oxidized from the edge of the mesa to form an annular shaped current confinement region in the VCSEL device. Alternatively, trenches or depressions are formed to access and oxidize the high aluminum bearing layer as taught in U.S. Pat. No. 5,903,588. By controlling the time of oxidization, the size of the annular shaped current confinement region can be controlled. VCSELs fabricated using these methods are often called oxide-confined VCSELs. While oxide-confined VCSELs are thought to be optically and electrically beneficial, they can be difficult to implement in practice. One reason for the difficulty is that the intentionally oxidized layer, or oxide aperture forming layer, usually has a high aluminum content and is sandwiched between layers having lower aluminum content, which may oxidize at considerably different rates. This can result in significant band discontinuities between the layers. These band discontinuities can detrimentally increase the electrical resistance of the structure and form a barrier to current flow. Attempts have been made to reduce these band discontinuities, but such attempts often result in a relatively thick oxide layers due to partial oxidation of the adjacent layers, which can increase the unwanted optical effects of the oxide layer or layers. Another limitation of many oxide-confined VCSELs is that during the lateral oxidation of the high aluminum oxide aperture forming layer, the other mirror layers that have a lower aluminum concentration are also laterally oxidized to some degree but not to the same degree as the high-aluminum oxide aperture forming layer. It is believed that the lateral oxidation of the aluminum bearing layers creates crystalline defects or the like along the junction between the oxidized region and the non-oxidized region. These crystalline defects are believed to reduce the stability and/or reliability of the device. Regardless of whether an oxide-confined DBR is provided, it is often beneficial for a DBR to be highly reflective, highly electrically conductive and have good thermal conductivity. For example, when a DBR is used in a VCSEL, it often is beneficial to have the DBR be sufficiently reflective so as to reduce optical losses to such a degree that efficient laser operation is achieved. Reflectivity is typically achieved by stacking material layers having significantly different indexes of refraction, for example, by stacking alternating layers of AlAs and GaAs. Such stacked layers can produce an optical standing wave within the DBR. While the optical performance of stacked AlAs and GaAs is typically good, an abrupt junction between an AlAs layer and a GaAs layer is thought to form a high barrier to current flow. To reduce that barrier, the layers of AlAs and GaAs are typically joined using a transition region in which the material composition gradually changes from AlAs to GaAs. Furthermore, in most VCSELs, the DBR layers are doped to provide free carriers that reduce electrical resistance. The result is a structure that, ideally, has high reflectivity combined with both low optical absorption and low electrical resistance. In practice, optical absorption increases with increasing electric field strength, increasing wavelength, and increasing doping levels. On the other hand, electrical resistance is relatively unaffected by electrical field strength, yet decreases with increasing doping levels. Therefore, obtaining both low optical absorption and low electrical resistance can be a challenge. That is, a conflict often exists between achieving reduced electrical resistance, by making the free carrier concentration higher, and reducing light absorption by making the free carrier concentration lower. Additionally, the materials that form a DBR can strongly impact the thermal characteristics of the DBR. Binary phase materials, such as AlAs and GaAs, tend to have relatively good thermal conductivity. Thus, heat typically flows across AlAs and GaAs stacks relatively well. However, the transition region, which is characterized by three materials (e.g. AlGaAs), can have a significantly lower thermal conductivity. This is because the crystalline structure of the alloyed transition region tends to scatter phonons, the primary carriers of heat which tends to reduce the thermal conductivity of the structure. Because of the foregoing, many prior art DBRs can have excessive optical absorption, relatively poor thermal conductivity, and/or relatively high electrical resistance. BRIEF SUMMARY OF THE INVENTION The present invention overcomes many of the disadvantages of the prior art by providing an improved oxide-confined mirror structure that can be used to form VCSELs (Vertical Cavity Surface Emitting Lasers), RCPDs (Resonant Cavity Photo Diode), RCLEDs (Resonant Cavity Light Emitting Diodes) and other suitable optoelectronic devices. In one illustrative embodiment, an oxide-confined DBR is provided that has a reduced band discontinuity between an oxide aperture forming layer with a relatively high aluminum concentration and an adjacent layer with a lower aluminum concentration. This may be accomplished by providing a transition layer on at least one side of the oxide aperture forming layer. The transition layer may have a graded aluminum concentration that provides a transition from the relatively high aluminum concentration of the oxide aperture forming layer to the low aluminum concentration of the adjacent high index low Al (˜0.15) layer. Alternatively, or in addition, the oxide aperture forming layer may be heavily doped since it may be placed at a null of the optical field. This may allow for improved electrical conduction on the graded side, as well as improved conduction of the side that is stepped to ˜x=0.65. The use of a substantially lower aluminum concentration on both sides of the oxide aperture forming layer helps prevent the layer from becoming excessively thick upon oxidation, since oxidation of adjacent layers is substantially reduced by the low aluminum composition. It is believed that the transition layer, as well as the heavy doping of the oxide aperture forming layer, may help produce a DBR mirror that has reduced band discontinuities as well as a lower electrical and thermal resistance, all of which may contribute to a more efficient and reliable device. The present invention also contemplates providing an oxide-confined DBR that uses an implant, etch or any other suitable method or process for reducing or eliminating some or all of the electrical artifacts believed to be caused by the junction between oxidized and un-oxidized regions of at least some of the laterally oxidized layers. In some embodiments, this is accomplished by providing an implant that increases the resistivity of selected layers in or around the oxidized and un-oxidized junctions. The increased resistivity may effectively remove the selected oxidized and un-oxidized junctions from contributing to the electrical characteristics of the device. In other embodiments, a patterned etch may be used to remove the selected oxidized and un-oxidized junctions. The selected layers may include, for example, those layers that have a lower aluminum concentration than an oxide aperture forming layer, which will therefore, exhibit a shorter lateral oxidized region than the oxidized aperture forming layer. The present invention also contemplates a Distributed Bragg Reflector (DBR) that has relatively low light absorption, relatively low electrical resistance, and/or relatively good thermal conductivity. The DBR may or may not include an oxide aperture, as described above. In some embodiments, the DBR may include a first mirror layer and a second mirror layer, with an interface therebetween. The second mirror layer may include an aluminum concentration that is higher than the aluminum concentration in the first mirror layer. A step transition is provided in the aluminum concentration at or near the interface between the first mirror layer and the second mirror layer. This step transition in aluminum concentration may help increase the refractive index contrast between the first and second mirror layers, which can increase the reflectivity of the DBR. To help increase the electrical and/or thermal conductivity of the DBR, the second mirror layer, which has a higher concentration of aluminum, may include a doping concentration that is relatively high, such as at or above 1E19 atoms/cm 3 at least at or near the interface between the first and second mirror layers. In some illustrative embodiments, the first mirror layer may include a lower doping concentration than the second mirror layer, and a step transition may be provided in the doping concentration at or near the interface of the first mirror layer and the second mirror layer. To reduce optical absorption, and in an illustrative embodiment of the present invention, the interface between the first and second mirror layers may be positioned at or near a null in the optical electric field within the DBR. In some embodiments, the DBR may also include a graded interface that includes a graded aluminum concentration from a higher aluminum concentration to a lower aluminum concentration, or visa-versa. The graded interface may have a relatively lower doping concentration, such as below about 6E18 atoms/cm 3 , and may be positioned at or near a peak in the optical electric field within the DBR. In some embodiments, stepped interfaces as described above may be positioned at or near the nulls in the optical electric field within the DBR, and the graded interfaces may be positioned at or near the peaks in the optical electric field within the DBR. In some cases, this configuration may help produce a DBR that has relatively low light absorption, relatively low electrical resistance, enhanced reflectivity and relatively good thermal conductivity. BRIEF DESCRIPTION OF THE DRAWING These and other advantages of the present invention the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, in which like reference numerals designate like parts throughout the figures thereof and wherein: FIG. 1 illustrates a conventional VCSEL device; FIG. 2 illustrates a VCSEL device in accordance with one illustrative embodiment of the present invention; FIG. 3 is a cross-sectional view of an illustrative DBR used in the VCSEL device of FIG. 2 ; FIG. 4 is a graph that shows the Al concentration of a section of an illustrative DBR used in the VCSEL device of FIG. 2 ; FIG. 5 is a graph that shows the Al concentration and acceptor concentration of a section of an illustrative DBR used in the VCSEL device of FIG. 2 ; FIG. 6 is a graph showing an illustrative optical standing wave in the DBR of FIG. 2 ; FIG. 7 shows two graphs that illustrate the reduction in the valence band energy barrier of the oxide aperture forming layer 140 versus doping level; FIG. 8 is a cross-sectional side view of an illustrative VCSEL which includes an implant for reducing or eliminating some or all of the electrical artifacts believed to be caused by the junction between the oxidized and non-oxidized regions of a laterally oxidized DBR; FIGS. 9A-9D are schematic top view diagrams showing a number of illustrative embodiments for reducing or eliminating some or all of the electrical artifacts believed to be caused by the junction between the oxidized and non-oxidized regions of a laterally oxidized DBR; FIGS. 10A-10B are cross-sectional side views of another illustrative VCSEL which includes an etch for reducing or eliminating some or all of the electrical artifacts believed to be caused by the junction between the oxidized and non-oxidized regions of a laterally oxidized DBR; FIG. 11 is a graph showing the an illustrative aluminum concentration profile across a portion of an Al x Ga (1−x) As DBR; FIG. 12 is a graph showing an illustrative doping concentration profile across the same portion of the Al x Ga (1−x) As DBR of FIG. 11 ; FIG. 13 is a graph showing simulated valence and Fermi energy profile across the same portion of the Al x Ga (1−x) As DBR of FIGS. 11-12 , with a 0.3V forward bias applied; and FIG. 14 is a graph showing simulated valence and Fermi energy profile across the same portion of the Al x Ga (1−x) As DBR of FIGS. 11-12 , with a 0.3V reverse bias applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides for improved oxide-confined mirror structures suitable for use with VCSELs, RCPDs and/or other optoelectronic devices. Examples of such oxide-confined mirror structures used in conjunction with VCSEL devices are illustrated and their operation is explained with reference to FIGS. 2-10B . FIG. 2 illustrates a simplified “cut-away” schematic depiction of a VCSEL 100 in accordance with the present invention. As FIG. 2 is an improved version of the VCSEL 10 shown in FIG. 1 , the same numbers will be used for similar elements in FIG. 2 as were used in FIG. 1 . However, the VCSEL 100 includes an improved upper distributed Bragg reflector (DBR) 238 , as further described below. As shown in FIG. 2 , the illustrative VCSEL 100 includes an n-doped gallium arsenide (GaAs) substrate 12 having an n-type electrical contact 14 . An n-doped lower mirror stack 16 (a DBR) is positioned on the GaAs substrate 12 , and an n-type lower spacer 18 is disposed over the lower mirror stack 16 . An active region 20 having P-N junction structures with at least one but preferably a number of quantum wells is formed over the lower spacer 18 . The composition of the active region 20 may be AlGaAs, with the specific aluminum content varying in the different layers that form the active region 20 . One layer, for example, can have between twenty and thirty percent of aluminum, while an adjacent layer can have between zero and five percent of aluminum. There could be many alternating layers in the active region 20 . While an active region using quantum wells is illustrated, it is contemplated that any suitable active region may be used. On the active region 20 is a p-type top spacer 22 . A p-type upper mirror stack 238 (another DBR) is shown disposed over the top spacer 22 . The upper mirror stack 238 is described in more detail below. In the illustrative embodiment, a p-type conduction layer, a p-type GaAs cap layer, and a p-type electrical contact, collectively designated as 260 , are provided over the upper mirror stack 238 . As in the VCSEL 10 (see FIG. 1 ), the lower spacer 18 and the top spacer 22 may be used to separate the lower mirror stack 16 from the upper mirror stack 238 such that an optical cavity that is resonant at a specific wavelength is formed. Referring now to FIGS. 2 and 3 , the upper mirror stack 238 may include a layer that includes a heavily doped oxide aperture forming layer 140 . The oxide aperture forming layer 140 preferably has a relatively high Al content (e.g. over 95%, and beneficially about 98%) to facilitate lateral oxidation as further described below. The oxide aperture forming layer 140 is disposed between a first layer 142 , which has a comparatively lower Al content, (e.g. between 0% and 35%, and beneficially about 15%), and a second layer 144 , which has a comparatively medium Al content (e.g. around 65%, but preferably less than 85%). The oxide aperture forming layer 140 may be disposed at or near a null or a node of the optical electric field produced by resonant light (described in more detail subsequently with reference to FIG. 6 ), but this is not required in all embodiments. Referring now specifically to FIG. 3 , a transition layer or region 146 is provided between the first layer 142 and the oxide aperture forming layer 140 . In the illustrative embodiment, the transition layer 146 is a relatively thin layer that is about 20 nanometers thick and includes a change in Al concentration across its thickness that varies substantially linearly (described in more detail subsequently with reference to FIG. 4 ). However, other configurations and compositions may also be used. The second layer 144 and the oxide aperture forming layer 140 may abut, as shown. FIG. 4 shows the aluminum concentration of the second layer 144 , the oxide aperture forming layer 140 , the transition layer or region 146 , and the first layer 142 in accordance with one illustrative embodiment of the present invention. At some distance x from the substrate 12 , the second layer 144 , having an Al content of beneficially 65%, begins. At a distance y, a step change in the Al content occurs where the oxide aperture forming layer 140 starts. As noted above, the oxide aperture forming layer 140 may have a Al content of, for example, greater than 95% and more preferably about 98%. Then, at some distance n, the transition region 146 begins. Over a distance of about 20 nanometers in the illustrative embodiment, the Al content of the transition region 146 drops from that of the oxide aperture forming layer 140 (e.g. about 98%) to about 15%, which is the Al content of the first layer 142 in the illustrative embodiment. At a distance of n+20 nanometers the first layer 142 begins. FIG. 5 shows the aluminum concentration and acceptor concentration of the second layer 144 , the oxide aperture forming layer 140 , the transition layer or region 146 , and the first layer 142 in accordance with another illustrative embodiment of the present invention. As can be seen, the second layer 144 has an Al content of about 65% and an acceptor concentration of about 2.2E18 atoms/cm 3 . The oxide aperture forming layer 140 has a Al content of about 98% and is doped with an acceptor concentration of about 5E18 atoms/cm 3 . Following the oxide aperture forming layer 140 is the transition layer or region 146 . The transition layer or region 146 is AlGaAs with a thickness of about 20 angstroms, and has an Al content that begins at about 90%, before dropping in a linear manner to about 15%, which is the Al content of the first layer 142 . The acceptor concentration of the transition layer or region 146 drops from about that of the oxide aperture forming layer 140 (e.g. about 5E18 atoms/cm 3 ) to about 5E17 atoms/cm 3 . The first layer 142 has a relatively constant Al content of about 15%, and an acceptor concentration that ramps up from about 5E17 atoms/cm 3 to 2E18 atoms/cm 3 before falling back to about 5E17 atoms/cm 3 , as shown. While the illustrative embodiment detailed in FIGS. 4 and 5 includes a transition region 146 with a thickness of 20 nanometers, it is contemplated that any thickness may be used. In a preferred embodiment, the thickness of the transition region 146 is between about 10 to 50 nanometers, and more beneficially about 20 nanometers, but this is not required in all embodiments. For thinner transition regions, higher acceptor doping concentrations may be desirable, while for thicker transition regions, lower acceptor doping concentrations may be desirable. A thicker transition region will typically result in a thicker oxide layer along the oxide aperture forming layer 140 , which in some cases, may be less desirable. In addition, the Al concentration and acceptor concentration are shown varying substantially linearly across the thickness of the transition region 146 . It is contemplated, however, that non-linear ramps may be used including, for example, exponential ramps such as parabolic ramps. In some cases, non-linear ramps, or even discontinuous ramps, may provide a more optimal profile. Referring now once again to FIG. 2 , oxide aperture forming layer 140 of the upper mirror stack 238 can include an oxide insulating region 148 . In the illustrative embodiment, the insulating region may be produced by oxidizing the oxide aperture forming layer 140 from a lateral edge of the upper mirror stack 238 to form an annular ring. A trench, several trenches or holes may be etched around at least part of the periphery of the VCSEL 100 to facilitate the lateral oxidation of the oxide aperture forming layer 140 , as taught in U.S. Pat. No. 5,903,588, which is incorporated in its entirety by reference. In operation, an external bias is applied which causes an electrical current 21 to flow from the p-type electrical contact 260 , through the p-type upper mirror stack 238 including the first layer 142 , the transition layer or region 146 , the un-oxidized region of the oxide aperture forming layer 140 (i.e., the area that is not shaded), the second layer 144 , the p-type top spacer 22 , the active region 20 , the n-type lower spacer 18 , the n-type lower mirror stack 16 , the n-doped GaAs substrate 12 and to the n-type electrical contact 14 . Some of the current that flows through the active region 20 produces photons, which as described above, reflect between the p-type upper mirror stack 238 and the n-type lower mirror stack 16 . In the illustrative embodiment shown, the p-type upper mirror stack 238 may be made slightly less reflective than the n-type lower mirror stack 16 to allow more of the light 23 to exit the top of the VCSEL 100 , as shown. However, other configurations are also contemplated. For example, for a bottom emitting VCSEL, the n-type lower mirror stack 16 may be made slightly less reflective than the p-type upper mirror stack 238 to allow more of the light to exit the bottom of the VCSEL 100 . The threshold of the VCSEL 100 is dependent upon the resistance of the upper mirror stack 238 primarily because of free carrier absorption. Because the oxide aperture forming layer 140 includes a significantly higher concentration of aluminum than the first layer 142 , there may be a significant band discontinuity between the first layer 142 and the oxide aperture forming layer 140 , which may provide an energy barrier that increases the effective resistance of the upper mirror stack 238 through to the active region 20 . To help reduce the effect of this band discontinuity, the present invention contemplates providing transition layer or region 146 between the first layer 142 and the oxide aperture forming layer 140 . As noted above, the transition layer or region 146 preferably is about 20 nanometers thick and includes a change in Al concentration across its thickness that varies substantially linear from at or near the Al concentration of the oxide aperture forming layer 140 to at or near the Al concentration of the first layer 142 . This helps smooth out the band discontinuity between the first layer 142 and the oxide aperture forming layer 140 . In addition, the oxide aperture forming layer 140 is preferably heavily p-doped (e.g. greater than 1E18 atoms/cm 3 , more beneficially 5E18 atoms/cm 3 ). The heavy doping of the oxide aperture forming layer 140 may help alter the valence band energy barrier introduced by the oxide aperture forming layer 140 , which may help reduce the band discontinuity between the first layer 142 and the oxide aperture forming layer 140 . The reduction of the valence band energy barrier with doping level of the oxide aperture forming layer 140 is illustrated in FIG. 7 . The graph on the left of FIG. 7 shows the valence band energy of the oxide aperture forming layer 140 with little or no doping, while the graph on the right shows the reduced valence band energy of the oxide aperture forming layer 140 with increased doping. The heavy doping level of the oxide aperture forming layer 140 may also help reduce the resistance of the oxide aperture forming layer 140 , and the thinness of the compositional ramp of the transition region 146 may also help reduce the electrical resistance of the upper mirror stack 238 . It is recognized that a transition layer or region may not be necessary between the oxide aperture forming layer 140 and the second layer 144 because the band discontinuity in this direction is a diode with forward current flow in a downward direction toward the active region 20 . The heavy doping of layer 140 reduces the forward drop of this diode. However, such a transition layer or region may be provided if desired. This technique of using a direct drop of composition with heavy doping at the forward biased diodes at or near a null of the electric field may be used in other layers of the DBR to improve thermal conductivity by avoiding ramps of ternary materials. FIG. 6 illustrates the absolute value of an optical electric field 402 of a standing wave developed within the upper mirror stack 238 . As shown, the optical electric field 402 is very low near position y of FIG. 6 (possibly becoming zero in the center of the oxide aperture forming layer 140 ). The oxide aperture forming layer 140 is preferably positioned at or near position y (i.e., a null of the optical electric field), which may help reduce the optical absorption of the oxide aperture forming layer 140 . However, in some embodiments, the oxide aperture forming layer 140 may be positioned at or near a node of the optical electric field or somewhere in between, depending on the application. As noted above, another limitation of many oxide-confined VCSELs is that during the lateral oxidation of the high aluminum oxide aperture forming layer 140 , the other mirror layers that have a lower aluminum concentration are also laterally oxidized to some degree (usually unintentionally). It is believed that the lateral oxidation of the aluminum bearing layers creates crystalline defects or the like along the junction between the oxidized region and the non-oxidized region. These crystalline defects are believed to reduce the stability and/or reliability of the device. FIG. 8 is a cross-sectional side view of an illustrative VCSEL which includes an implant for reducing or eliminating some or all of the electrical artifacts believed to be caused by the junction between the oxidized and non-oxidized regions of a laterally oxidized DBR. A wafer substrate 160 is shown, with an exemplary number of two VCSELs 162 and 164 positioned adjacent to one another. The illustrative VCSELs 162 and 164 are formed on an n-doped gallium arsenide (GaAs) substrate 160 having an n-type electrical contact 168 . An n-doped lower mirror stack 172 (a DBR) is positioned on the GaAs substrate 160 , and an n-type lower spacer 177 is disposed over the lower mirror stack 172 . An active region 176 having P-N junction structure with at least one but preferably a number of quantum wells is formed over the lower spacer 177 . The composition of the active region 176 is preferably AlGaAs, with the specific aluminum content varying in the different layers that form the active region 176 . One layer, for example, may have between twenty and thirty percent of aluminum, while an adjacent layer might have between zero and five percent of aluminum. There could be many alternating layers in the active region 176 . While an active region using a quantum well structure is illustrated, it is contemplated that any suitable active region may be used. On the active region 176 is a p-type top spacer 178 . A p-type top mirror stack 180 (another DBR) is shown disposed over the top spacer 178 . The upper mirror stack 180 is preferably similar to that described above with respect to FIGS. 2-7 . That is, an oxide aperture forming layer 190 (analogous to oxide aperture forming layer 140 ) is provided between a first layer 192 (analogous to first layer 142 ) and a second layer 194 (analogous to second layer 144 ). A transition layer or region 196 can be provided between the first layer 192 and the oxide aperture forming layer 190 , as described above. In the illustrative embodiment, a p-type conduction layer and a p-type GaAs cap layer, collectively shown at 182 , may be provided over the top mirror stack 180 . A p-type electrical contact layer 184 may then be provided for making electrical contact to the VCSELs 162 and 164 . To produce oxide-confined VCSELs, a trench, several trenches or holes may be etched around at least part of the periphery of each VCSEL 162 and 164 to facilitate the lateral oxidation of the oxide aperture forming layer 190 . In FIG. 8 , the illustrative trenches are shown at 198 a , 198 b and 198 c . Some illustrative trench and hole configurations are shown in FIGS. 9A-9D . The trenches 198 a , 198 b and 198 c of FIG. 8 extend down to the oxide aperture forming layer 190 , but preferably do not extend down into the active region 176 as shown in FIG. 8 , but this is not required in all embodiments. As can be seen, many configurations are possible as will become apparent to those skilled in the art. With the trenches 198 a , 198 b and 198 c in place, the wafer is exposed to an oxidizing environment. The oxidizing environment oxidizes any layers that are exposed by the trenches 198 a , 198 b and 198 c and have a concentration of oxidizable material, such as aluminum. The lateral distance that the each of the layers is oxidized is dependent on the concentration of the oxidizable material contained in the layer. Thus, in the illustrative embodiment, the oxide aperture forming layer 190 , which has a relatively high aluminum concentration, oxidizes at a much greater rate and thus a much further distance into the DBR than the other exposed aluminum bearing layers of the DBR 180 . In one example, the oxide aperture forming layer 190 oxidizes two to fifteen times the distance into the DBR than the other exposed aluminum bearing layers of the DBR 180 , more preferably about 10 times or more. In some cases, high oxidation distance contrast ratios are selected to help minimize any mechanical stress in the active optical aperture of the device. It is recognized, however, that any suitable oxidation distance contrast ratio may be selected, depending on the application. Referring specifically to FIG. 8 , the oxide aperture forming layer 190 of DBR 180 includes an oxidized region 202 that extends from the edge 204 of the trench 198 a to an oxide termination junction 206 that is situated greater than a first distance 208 from the edge 204 of the trench 198 a . It is contemplated that in some embodiments, there may be more than one oxide aperture forming layer, as desired. The other aluminum bearing layers, such as the AlGaAs layers of the DBR 180 , are also (unintentionally) laterally oxidized by the oxidizing environment, but to a lesser extent. For example, AlGaAs layer 210 includes an oxidized region 212 that extends from the edge 204 of the trench 198 a to an oxide termination junction 214 that is situated less than a second distance 216 from the edge 204 of the trench 198 a . Note that the first distance 208 is greater than the second distance 216 . It is believed that the lateral oxidation of the aluminum bearing layers can create crystalline defects or the like along the oxide termination junction, such as oxide termination junction 214 between the oxidized region and the non-oxidized region. These crystalline defects are believed to contribute to the reduction of the stability and/or reliability of the device. For instance, the crystalline defects are believed to cause mechanical stress at the oxide termination junctions, which under some circumstances, can propagate through the device over time. Differences in thermal expansion of the oxidized material and the non-oxidized material can further increase the mechanical stress within the device, which may further help propagate defects such as dark lines into the semiconductor material of the device. It is believed that these may contribute to an increase in the infant mortality rate and a reduction in the long term reliability of the device. An implant, etch or any other suitable method or process may be used to reduce or eliminate some or all of the electrical artifacts associated with the oxide termination junctions. For example, in FIG. 8 , a patterned implant shown generally by dotted line 218 is provided to isolate the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 from the active current aperture of the device. In the illustrative embodiment, the implant 218 is preferably a proton implant (H+) that extends from at least the edge 204 of the trench 198 a to a location beyond the second distance 216 , but not as far as the first distance 208 , but this is not required in all embodiments. In some embodiments, for example, the implant 218 may only extend across a region that encompasses the oxide termination junctions of concern. In yet another illustrative embodiment, the implant 218 may extend along a region that resides entirely between the second distance 216 and the first distance 208 . To help electrically isolate adjacent VCSELs on the wafer, the implant 218 can extend down past the active region 176 as shown in FIG. 8 , but this is not required in all embodiments. Preferably, the implant 218 renders the affected material non-conductive or at least more resistive, which may help electrically isolate the oxide termination junctions of the AlGaAs layers (but preferably not the oxide aperture forming layer 190 ) from the active current aperture of the device. It is contemplated that any suitable implant may be used, including a proton implant, a helium implant, an implant of an electrically active impurity such as silicon, germanium, beryllium, etc., and/or any other process or method that disrupts the conductivity of the material so as to reduce or eliminate one or more electrical artifacts related to the oxide termination junctions from adversely affecting the operation of the device. The implant 218 may further provide an implant interface that is relatively stress free to help guide the recombination current through the active current aperture of the device. The same or similar implants may be used in and around trenches 198 b and 198 c , as shown in FIG. 8 . It is contemplated that the trenches 198 a , 198 b and 198 c may be left open, or filled with an insulating or other material either before or after the implant, as desired. It is believed that the implant 218 may be used to help prevent the propagation of defects from and separates the mechanical stress from the oxide termination junctions of the AlGaAs layers into the active current aperture of the device. It is also believed that the implant 218 may help reduce the potential for recombination to occur at or near the stress points and/or defects caused by the oxide termination junctions of the AlGaAs layers. This is particularly important near the active region 176 , where a vast majority of the carriers recombine during the operation of the device. In some embodiments, and as shown in FIG. 8 , trenches 198 a , 198 b and 198 c may not extend all the way down to the active region 176 , which may further help isolate the active region 176 from the mechanical stress points and/or defects caused by the oxide termination junctions. In addition, or alternatively, it is contemplated that a relief etch followed by an implant may be used to help isolate adjacent devices. For example, when a shallow implant cannot penetrate a sufficient or desired distance into or through the top DBR mirror 180 , it is contemplated that a relief etch, such as relief etch 198 a , 198 b and 198 c , may be provided into or through the top DBR to help reduce the thickness of the top DBR mirror 180 . With the reduced thickness, the shallow implant can then penetrate a sufficient or desired distance into or through the top DBR mirror 180 , as desired. Such an etch and implant may be used in helping to isolate laterally oxidized devices, as described above, as well as non-laterally oxidized devices (e.g. implant isolated devices), as desired. FIGS. 9A-9D are schematic top view diagrams showing a number of illustrative embodiments for reducing or eliminating some or all of the electrical artifacts believed to be caused by the oxide termination junctions between the oxidized and non-oxidized regions of a laterally oxidized DBR. In FIG. 9A , three or four holes 220 a , 220 b , 220 c and 220 d are etched into the top DBR 180 of FIG. 8 to expose the oxide aperture forming layer 190 . The device is then exposed to an oxidizing environment, which causes the oxide aperture forming layer 190 to laterally oxidize beyond the first distance 208 . At the same time, the exposed aluminum bearing AlGaAs layers of the DBR 180 also laterally oxidize, preferably to less than a second distance 216 from the edge 204 of the trench 198 a . In the illustrative embodiment shown in FIG. 9A , the extent of oxidization of the oxide aperture forming layer 190 from holes 220 a , 220 b , 220 c and 220 d is shown by dashed lines 222 a , 222 b , 222 c and 222 d , respectively. The conductive VCSEL aperture defined by the termination of the oxidation layer corresponds to region 226 . The extent of oxidization of the aluminum bearing AlGaAs DBR layers from holes 220 a , 220 b , 220 c and 220 d is shown by dashed lines 224 a , 224 b , 224 c and 224 d , respectively, which corresponds to the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 . An implant can then be provided to help isolate the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 from the conductive VCSEL aperture 226 . In the illustrative embodiment, the implant can be provided in the region between the dot-dashed lines 230 and 232 . However, in some embodiments, the outer dot-dashed line 230 may not be provided. In this embodiment, the implant would extend across the entire wafer or device except inside the dot-dashed line 232 . In another illustrative embodiment, and as shown in FIG. 9B , a number of trenches 239 a , 239 b , 239 c and 239 d may be etched into the upper DBR 180 of FIG. 8 to expose the oxide aperture forming layer 190 . The wafer is then exposed to an oxidizing environment, which causes the oxide aperture forming layer 190 to laterally oxidize beyond the first distance 208 (Not shown in FIG. 9B ). At the same time, the other aluminum bearing AlGaAs DBR layers laterally oxidize, preferably to less than a second distance 216 from the edge 204 of the trench 198 a . In the illustrative embodiment shown in FIG. 9B , the extent of oxidization of the oxide aperture forming layer 190 from trenches 239 a , 239 b , 239 c and 239 d is shown by dashed lines 240 a and 240 b . The conductive VCSEL aperture is defined by region 242 . The extent of oxidization of the aluminum bearing AlGaAs DBR layers from trenches 239 a , 239 b , 239 c and 239 d is shown by dot-dashed lines 244 a and 244 b , which corresponds to the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 . An implant can be provided to help isolate the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 from the conductive VCSEL aperture 242 . In the illustrative embodiment, the implant can be provided in the region between the dot-dashed lines 246 a and 246 b . However, in some embodiments, the outer dot-dashed line 246 b may not be provided. In this embodiment, the implant would extend across the entire wafer or device except inside the dot-dashed line 246 a . In yet another illustrative embodiment, and as shown in FIG. 9C , a single annular trench 250 can be etched into the top DBR 180 of FIG. 8 to expose the oxide aperture forming layer 190 . The wafer is then exposed to an oxidizing environment, which causes the oxide aperture forming layer 190 to laterally oxidize beyond the first distance 208 . At the same time, the other aluminum bearing AlGaAs DBR layers laterally oxidize, preferably to less than a second distance 216 from the edge 204 of the trench 198 a . In the illustrative embodiment, the extent of oxidization of the oxide aperture forming layer 190 from annular trench 250 is shown by dashed lines 252 a and 252 b . The conductive VCSEL aperture defined by the oxide aperture forming layer is shown at 254 . The extent of oxidization of the aluminum bearing AlGaAs DBR layers from annular trench 250 is shown by dot-dashed lines 256 a and 256 b , which corresponds to the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 . An implant can be provided to help isolate the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 from the conductive VCSEL aperture 254 . In the illustrative embodiment, the implant can be confined to the region defined between the dot-dashed lines 258 a and 258 b . However, in some embodiments, the outer dot-dashed line 258 b may not be provided. In this embodiment, the implant would extend across the entire wafer or device except inside the dot-dashed line 258 a . Rather than providing an annular trench 250 as shown, it is contemplated that a mesa may be formed, if desired. In yet another illustrative embodiment, and as shown in FIG. 9D , a C-shaped trench 270 can be etched into the top DBR 180 of FIG. 8 to expose the oxide aperture forming layer 190 . The wafer is then exposed to an oxidizing environment, which causes the oxide aperture forming layer 190 to laterally oxidize beyond the first distance 208 . At the same time, the other aluminum bearing AlGaAs DBR layers laterally oxidize, preferably to less than a second distance 216 from the edge 204 of the trench 198 a . In the illustrative embodiment, the extent of oxidization of the oxide aperture forming layer 190 from C-shaped trench 270 is shown by dashed lines 272 a and 272 b . The conductive VCSEL aperture defined by the oxide aperture forming layer is shown at 274 . The extent of oxidization of the aluminum bearing AlGaAs DBR layers from annular trench 270 is shown by dot-dashed lines 276 a and 276 b , which corresponds to the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 . As can be seen, and in the illustrative embodiment, the aluminum bearing AlGaAs DBR layers laterally oxidize to fill the space between the ends of the C-shaped trench 270 . An implant can be provided to help isolate the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 from the conductive VCSEL aperture 274 . In the illustrative embodiment, the implant can be confined to the region defined between the dot-dashed lines 278 a and 278 b . However, in some embodiments, the outer dot-dashed line 278 b may not be provided. In this embodiment, the implant would extend across the entire wafer or device except inside the dot-dashed line 278 a . FIGS. 1 OA- 1 OB are cross-sectional side views of another illustrative VCSEL that uses an etch to reduce or eliminate some or all of the electrical artifacts believed to be caused by the junction between the oxidized and non-oxidized regions of a laterally oxidized DBR. FIG. 10A is similar to the embodiment shown in FIG. 8 , but without the implant 218 . Rather than providing the implant 218 , or in addition to providing the implant 218 , it is contemplated that a patterned etch or milling can be used to remove the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 . FIG. 10B shows the VCSEL wafer of FIG. 10A after such a patterned etch or milling is performed. As can be seen, the patterned etch removes the oxide termination junctions of the AlGaAs aluminum bearing layers of the DBR 180 . In some embodiments, the patterned etch preferably extends vertically down past the active region, but this is not required in all embodiments. The lateral extent of the patterned etch may correspond to, for example, the extent of the implants shown in FIGS. 9A-9D . FIG. 11 is a graph showing the an illustrative aluminum concentration profile across a portion of an Al x Ga (1−x) As DBR. In the illustrative embodiment, and beginning on the left of the graph, the Al fraction (x) begins at about 1.0 (100%), which means the material along the left hand side in region 400 is AlAs. Next, a graded interface is provided, where the aluminum concentration is graded from 1.0 (100%) to 0.0 (0%) over a graded region 402 . That is, in the illustrative embodiment, the material is graded from AlAs in region 400 to GaAs in region 404 . While the grade is shown as including a series of sequential concentration steps 408 a - 408 d , it is contemplated that the grade may be a linear grade, a non-linear grade or any other suitable grade, as desired. In addition, it is contemplated that the aluminum concentration need not transition from 100% to 0%, as shown in FIG. 11 . Rather, the aluminum concentration may transition from any higher value to any lower value, such as from above about 60% to below about 40%, or any other suitable range as desired. Next, a stepped interface 410 is provided, where the aluminum concentration is stepped from 0.0 (0%) to 1.0 (100%). That is, in the illustrative embodiment, the material is stepped from GaAs in region 404 to AlAs in region 412 . While the aluminum concentration is shown as a step from 0% to 100%, it is contemplated that the aluminum concentration may transition from any lower value to any higher value. The step transition 410 in aluminum concentration may help increase the refractive index contrast between the region 404 and region 412 , which can increase the reflectivity of the DBR. The step transition 410 may also increase the thermal conductivity of the DBR, as further described below. Region 404 may correspond to a first mirror layer, region 412 may correspond to a second mirror layer, and region 400 may correspond to a third mirror layer in some embodiments. In practice there can be multiple sets of such layers. For example, a Distributed Bragg Reflector (DBR) may include tens, hundreds or thousands of such layers. FIG. 12 is a graph showing an illustrative doping concentration profile across the same portion of the Al x Ga (1−x) As DBR of FIG. 11 . Again, beginning from the left of the graph, the illustrative doping concentration profile is relatively low in regions 400 and 404 . The doping concentration may be, for example, at or below 5E18, or at or below 1E18 or lower, as desired. For illustrative purposes, the doping concentration is shown at 1E18. The doping concentration also includes a step 416 . In some embodiments, the step 416 in doping concentration goes from below about 5E18 in region 404 to greater than 1E19 in region 412 . More specifically, and in the illustrative embodiment shown in FIG. 12 , the step 416 in doping concentration goes from about 1E18 in region 404 to about 5E19 in region 412 . It is contemplated that the step 416 in doping concentration may coincide or substantially coincide with the step 410 in aluminum concentration (see FIG. 11 ). During operation, such a DBR will typically produce optical standing waves that are characterized by spatially dependent electrical fields. That is, the optical electric field strength typically varies across the DBR's thickness with alternating nulls and peaks. In some embodiments, the stepped interface 410 may be positioned at or near a null in the optical electric field, and the graded interface 402 is positioned at or near a peak in the optical electric field. Because the step 412 in aluminum concentration is positioned at or near a null in the optical electric field, the optical absorption of the material is less, and as a result is less dependent upon doping level. As such, region 412 may be more heavily doped to increase the electrical conductivity of the DBR. Because the graded transition 402 is positioned at or near a peak in the optical electric field, the doping level at the graded transition 402 may be lower to help reduce optical absorption caused by the locally high optical electric field. Also, the graded junction may help decrease the electrical resistance of the interface without significantly increasing the optical absorption. In the illustrative embodiment, the step transition 410 in aluminum concentration may also help increase the refractive index contrast between region 404 (e.g. first mirror layer) and region 412 (second mirror layer), which can increase the reflectivity of the DBR. The step transition 410 may also help increase the thermal conductivity of the DBR. As noted above, binary phase materials, such as AlAs and GaAs tend to have relatively good thermal conductivity because there is no transition or graded region that tends to scatter phonons, which tends to reduce the thermal conductivity of the structure. The illustrative portion of the DBR shown in FIGS. 11 and 12 is formed from layers of different compositions of Al x Ga 1−x As. While the principles of the present invention are particularly suitable for use in p-doped top mirror stacks (because p-doped materials are optically more absorbent, those materials benefit more from the present invention), the principles are suitable for use with either type of doping. Furthermore, while the illustrated embodiment is based on the Al x Ga 1−x As material system, the principles of the present invention are applicable to a wide range of compound semiconductor material systems, including some without Aluminum at all. More generally, the present invention may be applicable when, for example, there is a step in the electron affinity for a n-type DBR mirror and a step in hole affinity for a p-type DBR mirror. Hole affinity is defined herein as electron affinity minus the band gap of the material (e.g. electron affinity defined negatively). For n-type DBR mirrors, the heavier doped side may be the side that has the smallest magnitude (least negative) electron affinity. For p-type mirrors, the heaver doped side may be the side that has the largest magnitude (most negative) hole affinity. Usually this means that the highest doped side is the higher band gap material, but not always. Like above, the step in the electron affinity may be positioned at a null in the optical electric field, and a graded junction may be provided at the peak in the electric field. A further discussion of electron affinity in DBR's can be found in, for example, co-pending U.S. patent application Ser. No. 10/767,920, filed Jan. 29, 2004, entitled “ELECTRON AFFINITY ENGINEERED VCSELS”, which is incorporated herein by reference. FIG. 13 is a graph showing simulated valence and Fermi energy profiles across the same portion of the Al x Ga (1−x) As DBR of FIGS. 11-12 , with a 0.3V forward bias applied. It has been found, and as can be seen in the simulation results of FIG. 13 , a relatively heavily doped step junction can perform electrically similar to a more lightly doped graded junction, and yet provide additional benefits such as increased reflectivity and/or increased thermal conductivity. The valence energy band edge (Ev) is shown by line 420 and the Fermi energy profile (Efp) is shown at dotted line 422 . As can be seen, the valance energy band edge (Ev) at the stepped junction 410 has a narrow barrier 424 a that would appear to limit or prevent carrier conduction through the junction. However, the carrier barrier 424 is very narrow due to the stepped doping profile 416 . It has been found that the carrier barrier 424 is sufficiently narrow to allow tunneling currents to pass through the interface. The Fermi energy profile 422 shows 0.3V collectively provided across the graded interface 402 and stepped interface 410 , as shown at 430 . This 0.3V corresponds to the 0.3V forward bias (forward across the stepped junction and reverse across the graded junction) that has been applied. About 0.2V of the 0.3V forward bias lies across the graded interface 402 , and about 0.1V lies across the stepped interface 410 . Thus, the conductance of the stepped interface 410 is similar to the conductance of the graded interface 402 . The relative conductance of the stepped interface 410 versus the graded interface 402 , and thus the Fermi energy that lies across the stepped interface 410 , may be adjusted by adjusting the doping level in region 412 (see FIGS. 11 and 12 ). As can be seen, a relatively heavily doped step junction 410 can perform electrically similar to a more lightly doped graded junction 402 . The stepped interface 410 , however, may provide additional benefits such as increased reflectivity as well as increased thermal conductivity, as well as improved lateral conduction due to the heavy doping, all of which can be highly desirable in some applications. FIG. 14 is a graph showing simulated valence and Fermi energy profiles across the same portion of the Al x Ga (1−x) As DBR of FIGS. 11-12 , with a 0.3V reverse bias applied (reverse for the step junction and forward for the graded junction). In this example, the Fermi energy profile 434 shows −0.3V collectively provided across the graded interface 402 and stepped interface 410 , as shown at 436 . The −0.3V 436 corresponds to the −0.3V reverse bias that has been applied. About −0.1V of the −0.3V reverse bias lies across the graded interface 402 , and about −0.2V lies across the stepped interface 410 . Thus, the conductance of the stepped interface 410 is similar to the conductance of the graded interface 402 . The relative conductance of the stepped interface 410 versus the graded interface 402 , and thus the Fermi energy that lies across the stepped interface 410 , may be adjusted by adjusting the doping level in region 412 (see FIGS. 11 and 12 ). As can be seen, a relatively heavily doped step junction 410 can perform electrically similar to a more lightly doped graded junction 402 . The stepped interface 410 , however, may provide additional benefits such as increased reflectivity as well as increased thermal conductivity and increased lateral conductivity, all of which may be highly desirable in some applications. As an option on the low aluminum side close to the step junction, 410 , and the null of the optical field, high doping can also be used. That is, the stepped aluminum concentration and the stepped doping concentration do not need to coincide. A purpose of this doping is to increase lateral conduction. The graded junction can be graded in a variety of ways known to those skilled in the art, including for example graded aluminum and graded doping. The present invention also applies to other applications and/or material systems where grades are advantageously used at the peak of the optical electric field and as shown here heavily doped steps can be used at the nulls of the optical electric field. The embodiments and examples set forth herein are presented to best explain the present invention and its practical application and to thereby enable those skilled in the art to make and utilize the invention. Those skilled in the art, however, will recognize that the foregoing description and examples have been presented for the purpose of illustration and example only. Other variations and modifications of the present invention will be apparent to those of skill in the art, and it is the intent of the appended claims that such variations and modifications be covered. The description as set forth is not intended to be exhaustive or to limit the scope of the invention. Many modifications and variations are possible in light of the above teaching without departing from the spirit and scope of the following claims. It is contemplated that the use of the present invention can involve components having different characteristics. It is intended that the scope of the present invention be defined by the claims appended hereto, giving full cognizance to equivalents in all respects.","lang":"en","source":"USPTO_FULLTEXT","data_format":"ORIGINAL"}},"description_lang":["en"],"has_description":true,"has_docdb":true,"has_inpadoc":true,"has_full_text":true,"biblio_lang":"en"},"jurisdiction":"US","collections":[],"usersTags":[],"lensId":"198-681-319-134-535","publicationKey":"US_7596165_B2","displayKey":"US 7596165 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a first mirror layer having a substantially uniform doping concentration;\n
a second mirror layer positioned adjacent to the first mirror layer and the second mirror layer having an aluminum concentration that is higher than an aluminum concentration in the first mirror layer, wherein a transition from the aluminum concentration in the first mirror layer directly to the aluminum concentration in the second mirror layer takes the form of an upward step change in aluminum concentration that takes place entirely within the second mirror layer; and\n
the second mirror layer having a doping concentration that is at or above 1E19atoms/cm3 proximate the first mirror layer, and wherein a doping level change in the second mirror layer coincides substantially with the upward step change in aluminum concentration."],"number":1,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer includes a doping concentration, and the transition from the doping concentration in the first mirror layer to the doping concentration in the second mirror layer includes an upward step."],"number":2,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 2 wherein the step in concentration between the aluminum concentration in the first mirror layer to the aluminum concentration in the second mirror layer and the step in doping concentration between any doping concentration in the first mirror layer to the doping concentration in the second mirror layer are coincident or substantially coincident."],"number":3,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer includes a doping concentration that is at or below about 6E18 atoms/cm3."],"number":4,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 4 wherein the doping concentration in the first mirror layer is at or below about 1E18 atoms/cm3."],"number":5,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the doping concentration in the second mirror layer is at or above about 5E19 atoms/cm3 proximate the first mirror layer."],"number":6,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer includes an aluminum concentration that is below about 40%, and the second mirror layer includes an aluminum concentration that is above about 60%."],"number":7,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the aluminum concentration of the first mirror layer is zero or substantially zero."],"number":8,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer is GaAs, and the second mirror layer is AlAs."],"number":9,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein, during use, the Distributed Bragg Reflector (DBR) has an optical electric field that is produced by resonant light, the optical electric field having a number of nulls and a number of peaks, wherein an interface between the first mirror layer and the second mirror layer is located at or near a null in the optical electric field."],"number":10,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer has an optical thickness of about ¼ lambda."],"number":11,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 11 wherein the second mirror layer has an optical thickness of about ¼ lambda."],"number":12,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 further comprises:\n
a third mirror layer positioned adjacent to the first mirror layer such that the first mirror layer is between the third mirror layer and the second mirror layer, the third mirror layer having an aluminum concentration that is higher than the aluminum concentration in the first mirror layer, wherein the transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the third mirror layer includes a grade;\n
the third mirror layer having a doping concentration that is below the doping concentration in the second mirror layer."],"number":13,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer includes a doping concentration that is at or below about 6E18 atoms/cm3."],"number":14,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 14 wherein the third mirror layer includes a doping concentration that is at or below about 2E 18 atoms/cm3."],"number":15,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer includes a doping concentration that is substantially the same as the doping concentration of the first mirror layer."],"number":16,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 13 wherein, during use, the Distributed Bragg Reflector (DBR) has an optical electric field that is produced by resonant light, the optical electric field having a number of nulls and a number of peaks, wherein the interface between the third mirror layer and the first mirror layer is located at or near a peak in the optical electric field."],"number":17,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) comprising:\n
a graded interface having a graded aluminum concentration that changes from a first higher aluminum concentration to a first lower aluminum concentration, and further having a doping concentration;\n
a stepped interface having a stepped aluminum concentration from a second lower aluminum concentration to a second higher aluminum concentration, and further having a stepped doping concentration from a lower doping concentration to a higher doping concentration that coincides substantially with the stepped aluminum concentration from a second lower aluminum concentration to a second higher aluminum concentration, wherein the stepped aluminum concentration and the stepped doping concentration both occur entirely within a common layer of the DBR, the common layer being adjacent to another DBR layer whose aluminum concentration is about zero, and wherein the higher doping concentration is at least five times that of the doping concentration of the graded interface and is at or above 1E19 atoms/cm3; and\n
the Distributed Bragg Reflector (DBR) having an optical electric field that is produced by resonant light, the optical electric field having a number of nulls and a number of peaks, wherein the graded interface is positioned at or near a peak in the optical electric field and the stepped interface is positioned at or near a null in the optical electric field."],"number":18,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 18 wherein the higher doping concentration is at least ten times that of the doping concentration of the graded interface."],"number":19,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 19 wherein the higher doping concentration is at least fifteen times that of the doping concentration of the graded interface."],"number":20,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the first mirror layer is substantially comprised of GaAs."],"number":21,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein an aluminum (Al) concentration in the first mirror layer is about zero."],"number":22,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 1 wherein the second mirror layer substantially comprises AlAs."],"number":23,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer substantially comprises AlAs."],"number":24,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR) according to claim 13 wherein the third mirror layer includes a plurality of step changes in aluminum (Al) concentration."],"number":25,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector (DBR), comprising:\n
a first mirror layer having an aluminum concentration of about zero and having a substantially uniform doping concentration;\n
a second mirror layer positioned adjacent to the first mirror layer and the second mirror layer having an aluminum concentration that is higher than an aluminum concentration in the first mirror layer, wherein a transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the second mirror layer includes an upward step change in aluminum concentration that takes place entirely within the second mirror layer;\n
the second mirror layer having therein an upward step change in doping concentration, relative to a doping concentration of the first mirror layer, the upward step change in doping concentration of the second mirror layer occurring at substantially the same DBR position as a DBR position at which the upward step change in aluminum concentration occurs; and\n
a third mirror layer positioned adjacent to the first mirror layer such that the first mirror layer is between the third mirror layer and the second mirror layer, the third mirror layer having an aluminum concentration that is higher than the aluminum concentration in the first mirror layer, wherein the transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the third mirror layer includes a grade, and the third mirror layer having a doping concentration that is below the doping concentration in the second mirror layer."],"number":26,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector according to claim 26 wherein the DBR comprises an AlxGa(1-x)As DBR."],"number":27,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector according to claim 26 wherein:\n
the first layer substantially comprises GaAs; and\n
the second and third layers each substantially comprise AlAs."],"number":28,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector according to claim 26 wherein the transition from the aluminum concentration in the first mirror layer to the aluminum concentration in the second mirror layer includes one or more additional upward step changes in aluminum concentration."],"number":29,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector according to claim 26 wherein a doping concentration in the first layer is substantially the same as a doping concentration in the third layer."],"number":30,"annotation":false,"claim":true,"title":false},{"lines":["A Distributed Bragg Reflector according to claim 26 wherein the doping concentration of the second mirror layer is stepped up from a doping concentration of the first layer in a single step."],"number":31,"annotation":false,"claim":true,"title":false}]}},"filters":{"npl":[],"notNpl":[],"applicant":[],"notApplicant":[],"inventor":[],"notInventor":[],"owner":[],"notOwner":[],"tags":[],"dates":[],"types":[],"notTypes":[],"j":[],"notJ":[],"fj":[],"notFj":[],"classIpcr":[],"notClassIpcr":[],"classNat":[],"notClassNat":[],"classCpc":[],"notClassCpc":[],"so":[],"notSo":[],"sat":[]},"sequenceFilters":{"s":"SEQIDNO","d":"ASCENDING","p":0,"n":10,"sp":[],"si":[],"len":[],"t":[],"loc":[]}}