Curved grating surface emitting distributed feedback semiconduct

Details Curved grating surface emitting distributed feedback semiconduct Curved grating surface emitting distributed feedback semiconduct

1992-11-12

1994-09-06

Healy, Brian

Coherent light generators

Particular resonant cavity

Distributed feedback

372 7, 372 19, 372 43, 372 50, 372102, H01S 308, H01S 318

Patent

active

053454669

ABSTRACT:
An improved broad area surface emitting distributed feedback semiconductor laser diode device (10) includes a P-side ohmic contact (28) and an N-side ohmic contact (36). A potential difference is applied across these contacts to create an electric field that induces a stimulated emission of coherent photon radiation. The coherent photon radiation produced by the stimulated emission process is incident upon a second order grating having a curved pattern incorporated therein (29). An output beam, directed normal to a chemically etched output window (38), is produced by a first order diffraction of photon radiation from the surface of the second order curved grating (29). The output beam has a more uniform lateral mode near-field output intensity profile and a more uniform lateral mode near-field phase. The output beam also has a desired single-lobed lateral mode far-field output intensity profile. Moreover, the device (10) concentrates approximately 1 Watt of power into this single lateral mode far-field lobe.

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