Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1991-10-21
1992-11-17
Davie, James W.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 20, 372108, H01S 319
Patent
active
051649560
ABSTRACT:
Surface-emitting distributed feedback (DFB) lasers are disclosed with hybrid gratings. A first-order grating is provided at one or both ends of the active region of the laser for retroreflection of light back into the active region, and a second-order or nonresonant grating is provided at the opposite end for coupling light out perpendicular to the surface of the laser or in some other selected direction. The gratings may be curved to focus light retroreflected into the active region and to focus light coupled out to a point P. When so focused to a point, the DFB laser may be part of a monolithic read head for a laser recorded disk, or an optical coupler into an optical fiber.
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Davie James W.
Jones Thomas H.
Kusmiss John H.
Miller Guy M.
The United States of America as represented by the Administrator
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