Coherent light generators – Particular active media – Semiconductor
Patent
1991-11-07
1993-11-02
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 43, 372 45, 372 96, 372 99, H01S 319
Patent
active
052589900
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. Specific embodiments of the invention for generating red, green, and blue radiation are described.
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Jewell Jack L.
Olbright Gregory R.
Chafin James H.
Davie James W.
Moser William R.
Ojanen Karla
The United States of America as represented by the Secretary of
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