Coherent light generators – Particular active media – Semiconductor
Patent
1992-10-01
1994-08-30
Lee, John D.
Coherent light generators
Particular active media
Semiconductor
372 45, H01S 319
Patent
active
053434870
ABSTRACT:
In a vertical-cavity surface-emitting laser (VCSEL) with an active region, and first and second mirror stacks forming a resonant cavity, the VCSEL having a radial electrode configuration with a first electrode disposed around the base of the first mirror stack near one side of the active region, a second electrode on the other side of the active region with a first contacting region and a second contacting region on each side of the active region in contact with the respective electrodes, each of the contacting regions providing a current path for distributed current through the active region, the improvement wherein there is a nonlinear grading of resistivity in at least one of the contacting regions between at least one of the electrodes and the active region. Specifically, in one embodiment, the first contacting region has a first layered section abutting the first electrode which is highly conductive to radial current flow and at least a second layered section between the first layered section and the active region which is more resistive to axial current flow than to radial current flow in the first layered section. In a further embodiment, one of the two contacting regions includes a layered section which is radially graded in resistivity so as to restrict the current injection to a radius less than that of the resonant cavity, thereby improving device efficiency and preferentially supporting single mode operation.
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Coldren, L. A., et al., "Progress and Problems with Vertical-Cavity Lasers," May 16, 1991, pp. 338-339, CLEO Convention '91.
Coldren, L. A., et al., "High-efficiency Vertical Cavity Lasers and Modulators", SPIE, vol. 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications (Oct. 28, 1990), pp. 24-37.
Coldren Larry A.
Scott Jeffery W.
Lee John D.
Optical Concepts, Inc.
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