Distributed feedback semiconductor laser

Details Distributed feedback semiconductor laser Distributed feedback semiconductor laser

1984-10-15

1987-03-03

Davie, James W.

Coherent light generators

Particular resonant cavity

Distributed feedback

357 17, 372 46, 372 50, H01S 319

Patent

active

046480960

ABSTRACT:
A distributed feedback semiconductor laser which has periodic corrugations in a light emitting layer or an adjoining layer in the direction of travel of light and performs laser oscillation by the injection of carriers into said light emitting layer. In accordance with the present invention, there are provided, in the neighborhood of the center of a laser region, a region for changing the phase of the periodic corrugations by about 180 degrees, and, on the extension of the laser oscillation region at both sides thereof, a window region formed of a semiconductor larger in energy gap but smaller in refractive index than the light emitting layer, the length of the window region being so limited as to prevent substantial reflection of laser output light in the window region.

REFERENCES:
patent: 4096446 (1978-06-01), Haus et al.

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