Coherent light generators – Particular active media – Semiconductor
Patent
1992-11-05
1995-06-27
Epps, Georgia Y.
Coherent light generators
Particular active media
Semiconductor
372 46, 372 96, H01S 319
Patent
active
054286344
ABSTRACT:
A vertical cavity surface emitting laser that emits visible radiation is built upon a substrate, then having mirrors, the first mirror on top of the substrate; both sets of mirrors being a distributed Bragg reflector of either dielectrics or other materials which affect the resistivity or of semiconductors, such that the structure within the mirror comprises a plurality of sets, each having a thickness of .lambda./2n where n is the index of refraction of each of the sets; each of the mirrors adjacent to spacers which are on either side of an optically active bulk or quantum well layer; and the spacers and the optically active layer are from one of the following material systems: In.sub.z (Al.sub.y Ga.sub.1-y).sub.1-z P, InAlGaAs, AlGaAs, InGaAs, or AlGaP/GaP, wherein the optically active region having a length equal to m .lambda./2n.sub.eff where m is an integer and n.sub.eff is the effective index of refraction of the laser cavity, and the spacer layer and one of the mirrors being transmissive to radiation having a wavelength of .lambda.
, typically within the green to red portion of the visible spectrum.
REFERENCES:
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Bryan Robert P.
Lott James A.
Olbright Gregory R.
Schneider, Jr. Richard P.
Chafin James H.
Epps Georgia Y.
Moser William R.
Ojanen Karuna
The United States of America as represented by the United States
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