Metal spatial filter to enhance model reflectivity in a vertical cavity surface emitting laser
First Claim
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1. A surface emitting laser for emitting coherent light comprising:
- a substrate;
a plurality of semiconductor layers formed on said substrate;
one or more of said plurality of semiconductor layers forming an active region;
a conductive oxide semiconductor layer being one of said plurality of semiconductive layers, an annular metal layer formed on said conductive oxide semiconductor layer, said annular metal layer forming an output window for the fundamental mode of coherent light emitted by said active region, said annular metal layer suppressing reflectivity for the high orders of coherent light emitted by said active region;
a mirror of dielectric layers having quarterwave thickness formed on said annular metal layer and within said annular metal layer on said conductive oxide semiconductor layer; and
first and second electrodes which enable biasing of said active region to emit coherent light, said first electrode being formed on said annular metal layer.
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Abstract
An annular metal layer is provided between a conductive oxide layer and a dielectric mirror in a vertical cavity surface emitting laser. The annular metal layer defines the output window for the laser cavity which matches the TEM00 fundamental mode of the light beam emitted by the active region of the VCSEL. The metal layer outside the output window provides modal reflectivity discrimination against high order transverse modes of the light beam emitted by the active region of the VCSEL.
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Citations
9 Claims
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1. A surface emitting laser for emitting coherent light comprising:
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a substrate;
a plurality of semiconductor layers formed on said substrate;
one or more of said plurality of semiconductor layers forming an active region;
a conductive oxide semiconductor layer being one of said plurality of semiconductive layers, an annular metal layer formed on said conductive oxide semiconductor layer, said annular metal layer forming an output window for the fundamental mode of coherent light emitted by said active region, said annular metal layer suppressing reflectivity for the high orders of coherent light emitted by said active region;
a mirror of dielectric layers having quarterwave thickness formed on said annular metal layer and within said annular metal layer on said conductive oxide semiconductor layer; and
first and second electrodes which enable biasing of said active region to emit coherent light, said first electrode being formed on said annular metal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification