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Proceedings Paper

Phase Control Of Coherent Diode Laser Arrays Using Liquid Crystals
Author(s): Bill Cassarly; J. Michael FinIan; Michael DeJule; Charles Stein
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Paper Abstract

The on-axis fields from separate elements of a coherent laser array can interfere either constructively or destructively, depending upon the relative phases. We describe thin film transistor (TFT) and direct-drive controlled arrays of liquid crystal phase shifters, which provide both phase matching and fine beamsteering. The transmissive liquid crystal devices contain homogeneously aligned layers of nematic liquid crystals sandwiched between two glass plates. The devices impart electrically controllable analog phase delays to laser beams passing through the cells. The devices are divided into arrays of individually controlled elements using separate transparent electrodes.

Paper Details

Date Published: 22 June 1989
PDF: 8 pages
Proc. SPIE 1043, Laser Diode Technology and Applications, (22 June 1989); doi: 10.1117/12.976364
Show Author Affiliations
Bill Cassarly, GE Astro-Space Division (United States)
J. Michael FinIan, GE Astro-Space Division (United States)
Michael DeJule, GE Corporate Research and Development Center (United States)
Charles Stein, GE Corporate Research and Development Center (United States)

Published in SPIE Proceedings Vol. 1043:
Laser Diode Technology and Applications
Luis Figueroa, Editor(s)

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