VCSEL with unstable resonator
First Claim
1. An unstable resonator for a vertical cavity laser including a first semiconductor mirror stack, a plurality of semiconductor layers forming an active region positioned on the first semiconductor mirror stack, a second semiconductor mirror stack positioned on the active region so as to sandwich the active region between the first and second semiconductor mirror stacks, and the second semiconductor mirror stack being formed with more semiconductor layers adjacent an edge of the second semiconductor stack than in a central portion thereof so as to spatially modulate the reflectivity of the second semiconductor mirror stack such that reflectivity is reduced in the central portion of the second semiconductor mirror stack and increases toward the edge.
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Accused Products
Abstract
A vertical cavity laser with unstable resonator including a substrate having opposed major surfaces with a first semiconductor mirror stack positioned on one major surface of the substrate, an active region positioned on the first stack and a second semiconductor mirror stack positioned on the active region so as to sandwich the active region between the first and second stacks. Layers of the second stack being etched so as to spatially modulate the thickness of the second stack such that reflectivity is reduced in a central portion of the second stack and increases toward an edge thereof.
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Citations
12 Claims
- 1. An unstable resonator for a vertical cavity laser including a first semiconductor mirror stack, a plurality of semiconductor layers forming an active region positioned on the first semiconductor mirror stack, a second semiconductor mirror stack positioned on the active region so as to sandwich the active region between the first and second semiconductor mirror stacks, and the second semiconductor mirror stack being formed with more semiconductor layers adjacent an edge of the second semiconductor stack than in a central portion thereof so as to spatially modulate the reflectivity of the second semiconductor mirror stack such that reflectivity is reduced in the central portion of the second semiconductor mirror stack and increases toward the edge.
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4. An unstable resonator for a vertical cavity laser comprising:
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a substrate having first and second opposed major surfaces; a first semiconductor mirror stack positioned on the first major surface of the substrate; a plurality of semiconductor layers forming an active region, the active region being positioned on the first semiconductor mirror stack; a second semiconductor mirror stack positioned on the active region so as to sandwich the active region between the first and second semiconductor mirror stacks; and the second semiconductor mirror stack being formed with a larger number of semiconductor layers adjacent edges of the second semiconductor mirror stack than in a central portion thereof. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification