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VCSEL with unstable resonator

  • US 5,388,120 A
  • Filed: 09/21/1993
  • Issued: 02/07/1995
  • Est. Priority Date: 09/21/1993
  • Status: Expired due to Term
First Claim
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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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