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Proceedings Paper

Efficient, lightweight, broadbeam laser transmitter for space communications
Author(s): Raymond P. Liccini; Douglas R. Tomren; John G. Endriz; Edmund L. Wolak
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Paper Abstract

A compact, broad beam diode based laser transmitter has been developed for moderate range and data rate free space laser communications. The laser transmitter spatially combines high average power AlGaAs laser diodes in the near field and overlaps several beams into a uniform beam in the far field. Individual high brightness laser diodes are lensed with a cylindrical lens along the length of the emitting aperture and projected with a short focal length lens into a broad beam of several milliradian divergence in the far field. The engineering prototype laser transmitter consists of six precision aligned diode assemblies, two fold mirrors and a six lenslet macrooptic assembly all mounted on a beryllium baseplate. Data will be presented showing that the laser transmitter is highly efficient by reserving the inherent high brightness of the individual diodes in the optical design, by the development of a pulsed switcher electrical circuit based on recent lightweight dc power converter designs for spacecraft applications and the removal of excess diode heat via the beryllium baseplate.

Paper Details

Date Published: 16 August 1994
PDF: 13 pages
Proc. SPIE 2123, Free-Space Laser Communication Technologies VI, (16 August 1994); doi: 10.1117/12.184653
Show Author Affiliations
Raymond P. Liccini, TRW, Inc. (United States)
Douglas R. Tomren, TRW, Inc. (United States)
John G. Endriz, SDL, Inc. (United States)
Edmund L. Wolak, SDL, Inc. (United States)

Published in SPIE Proceedings Vol. 2123:
Free-Space Laser Communication Technologies VI
G. Stephen Mecherle, Editor(s)

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