Coherent light generators – Particular active media – Semiconductor
Patent
1992-05-08
1993-07-27
Epps, Georgia Y.
Coherent light generators
Particular active media
Semiconductor
372 94, 372 93, 372 99, 372102, 372 46, 372 50, 372 96, 372 20, 372 49, 372 97, H01S 319
Patent
active
052316424
ABSTRACT:
A semiconductor laser that includes at least one grating reflector with a grating period selected to diffract at a nonperpendicular angle within the plane of the laser waveguide. This allows dispersal of laser light, eliminating filamentary multimode operation of broad area lasers. In one embodiment, the grating reflector couples light between a single transverse mode waveguide portion of the optical cavity and a second, broad area, portion that is not collinear with the single mode waveguide. In another embodiment, the cavity favors a ring mode of oscillation. One or more grating reflectors form part of the feedback mechanism which forms a resonant optical cavity with noncollinear portions. Other reflectors in the feedback mechanism include facet reflectors which can be cleaved or ion milled, or semiconductor material refractive index boundaries. Laser embodiments with two or more grating reflectors can be independently tuned to provide a high rate of amplitude modulation. Spatial beam deflection and wavelength tuning are also achieved. A stable unidirectional ring laser is also described. Multiple ring laser cavities can also be coupled together by partially reflecting grating reflectors to form a laser array.
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Dzurko Kenneth M.
Hardy Amos
O'Brien Stephen
Scifres Donald R.
Waarts Robert G.
Epps Georgia Y.
Spectra Diode Laboratories, Inc.
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