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Proceedings Paper

Voltage calibration of dual-frequency liquid crystal devices for infrared beam steering applications
Author(s): Milind Mahajan; Bing Wen; Vinay Bhupathy; Donald Taber; Bruce Winker
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Paper Abstract

This paper addresses the use of liquid crystal devices for electro-optic infrared laser beam steering, such as liquid crystal optical phased arrays (OPAs) and digital beam deflectors (DBDs). In these devices, voltages are synchronously applied to different liquid crystal pixels to steer light, either by diffraction and/or refraction using birefringent prisms. Dual frequency liquid crystals provide an order of magnitude higher speed as compared to conventional nematic liquid crystals, at the cost of more complex addressing algorithms and control circuits. In order to optimize the optical performance of a liquid crystal device, the control voltages must be calibrated. This procedure involves adjustment of the control voltages while monitoring the optical efficiency, and must be done for both steady-state phase levels as well as transitions between phase levels. Manual voltage calibration is unrealistically time consuming for multi-channel beam steering devices. Computer based calibration algorithms for dual frequency liquid crystal devices are discussed, and results are presented for both steady state and dynamic voltage calibration procedures.

Paper Details

Date Published: 12 September 2005
PDF: 7 pages
Proc. SPIE 5892, Free-Space Laser Communications V, 58921A (12 September 2005); doi: 10.1117/12.618096
Show Author Affiliations
Milind Mahajan, Rockwell Scientific Co. (United States)
Bing Wen, Rockwell Scientific Co. (United States)
Vinay Bhupathy, Rockwell Scientific Co. (United States)
Donald Taber, Rockwell Scientific Co. (United States)
Bruce Winker, Rockwell Scientific Co. (United States)

Published in SPIE Proceedings Vol. 5892:
Free-Space Laser Communications V
David G. Voelz; Jennifer C. Ricklin, Editor(s)

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