Talbot filtered surface emitting distributed feedback semiconduc

Details Talbot filtered surface emitting distributed feedback semiconduc Talbot filtered surface emitting distributed feedback semiconduc

1992-04-24

1994-01-25

Davie, James W.

Coherent light generators

Particular resonant cavity

Distributed feedback

372 50, H01S 310, H01S 319

Patent

active

052822206

ABSTRACT:
A Talbot filtered surface emitting distributed feedback semiconductor laser array (12) includes two surface emitting distributed feedback semiconductor laser device subarrays (20, 22) that are separated by a free propagation region (24) having a length equal to a Talbot distance, z.sub.T. Within each subarray (20, 22) there is a like number of surface emitting distributed feedback semiconductor laser device elements (18) that are laterally isolated from each other by optical absorbing material stripes (26) to prevent evanescent coupling. A Talbot spatial filter array (28) of optical absorbing material islands (34) is fabricated in the free propagation region (24) at one half the Talbot distance. The Talbot spatial filter array (28) establishes fundamental lateral mode oscillation in the array (12), thereby producing a high quality laser beam with a predominantly single lobed far-field.

REFERENCES:
patent: 4985897 (1991-01-01), Botez et al.

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