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LARGE COLLIMATED OUTPUT BEAMS FROM DBR LASERS

IP.com Disclosure Number: IPCOM000024005D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 262K

Publishing Venue

Xerox Disclosure Journal

Abstract

The distributed Bragg reflector (DBR) laser 10 comprises the active layer 12 and confinement layers 14 and 16 supported on a substrate 18- Periodic gratings 20 provide suitable feedback for DBR mode of operation. Laser 10 is integral to a tapered waveguide 22 which is provided with an output grating 24.

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XEROX DISCLOSURE JOURNAL

LARGE COLLIMATED OUTPUT BEAMS FROM DBR LASERS
Robert D. Burnham
Donald R. Scifres
William Streifer

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Proposed Classification U~S~CL 331/94,.5 H
Int CL HOls 3/00

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The distributed Bragg reflector (DBR) laser 10 comprises the active layer 12 and confinement layers 14 and 16 supported on a substrate 18~ Periodic gratings 20 provide suitable feedback for DBR mode of operation. Laser 10 is integral to a tapered waveguide 22 which is provided with an output grating 24.

In operation, the light created by laser 10 enters the tapered guide region 22 where the light gradually spreads. The taper of region 22 is sufficiently gradual to prevent mode conversion.

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Volume 4 Number 3 May/3une 1979 363

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LARGE COLLIMATED OUTPUT BEAMS FROM DBR LASERS (Cont~d)

After spreading, the light enters the area of grating 24 which is illuminated over a large width and a highly collimated output beam 26 is obtained. A small, conventional DBR laser 10 having a laser filament between 5 to 20,~mcan produce a highly collimated beam having x and y parameters, respectively, of from 100 to l000,~m,

XEROX DISCLOSURE JOURNAL

364 Volume 4 Number 3 \4ay/June 1979

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