Coherent light generators – Particular resonant cavity – Specified cavity component
Patent
1993-03-04
1997-06-24
Davie, James W.
Coherent light generators
Particular resonant cavity
Specified cavity component
372 45, 372 50, 372 92, 372 96, H01S 319
Patent
active
056423764
ABSTRACT:
A vertical-cavity surface-emitting laser is disclosed comprising a laser cavity sandwiched between two distributed Bragg reflectors. The laser cavity comprises a pair of spacer layers surrounding one or more active, optically emitting quantum-well layers having a bandgap in the visible which serve as the active optically emitting material of the device. The thickness of the laser cavity is m .lambda./2n.sub.eff where m is an integer, .lambda. is the free-space wavelength of the laser radiation and n.sub.eff is the effective index of refraction of the cavity. Electrical pumping of the laser is achieved by heavily doping the bottom mirror and substrate to one conductivity-type and heavily doping regions of the upper mirror with the opposite conductivity type to form a diode structure and applying a suitable voltage to the diode structure. For radiation in the yellow to green portion of the spectrum, the laser includes an active layer of GaP or AlGaP quantum wells and AlP/AlGaP mirrors. For radiation in the blue portion of the spectrum, the laser includes an active region of InGaN or GaN quantum wells and AlN/AlGaN mirrors.
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Jewell Jack L.
Olbright Gregory R.
Davie James W.
Vixel Corporation
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