SPATIAL LIGHT MODULATORS

Performance evaluation of a liquid-crystal-on-silicon spatial light modulator

[+] Author Affiliations
Xinghua Wang, Bin Wang

Kent State University, Liquid Crystal Institute, Kent, Ohio?44242

John Pouch, Felix Miranda

NASA Glenn Research Center, Cleveland, Ohio?44135

James E. Anderson

Hana Microdisplay Technologies Inc., Twinsburg, OH?44087

Philip J. Bos

Kent State University, Liquid Crystal Institute, Kent, Ohio?44242 E-mail: pbos@kent.edu

Opt. Eng. 43(11), 2769-2774 (Nov 01, 2004). doi:10.1117/1.1794706
History: Received Sep. 30, 2003; Revised Nov. 17, 2004; Accepted Apr. 29, 2004; Online November 03, 2004
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2-D optical phased array antennas formed by a liquid crystal on silicon (LCOS) spatial light modulator are described for free-space laser communication and high-resolution wavefront control. The device consists of an 2-D array of 1024×768 phase modulator elements, each with controlled voltage, and can induce a phase shift from 0 to 2π for wavelengths up to the near IR. When the device is used as a wavefront corrector, 18.7 waves peak-valley (at 632.8 nm) of aberration in the optical system is corrected to a residual of 1/9 wave peak-valley, or 1/30 wave rms. The Strehl ratio improved from 0.006 to 0.83 after correction. An additional linear phase ramp was added to the correction phase ramp to simultaneously correct and steer the laser beam. Continuous steering over ±4 mrad in the X-Y plane with a steering accuracy higher than 10 μrad has been obtained. The 1-D beam-steering efficiency is 80% at the maximum steering angle of 4 mrad. These results suggest that an LCOS device can be used to achieve very high-resolution wavefront control at very high efficiency. © 2004 Society of Photo-Optical Instrumentation Engineers.

© 2004 Society of Photo-Optical Instrumentation Engineers

Citation

Xinghua Wang ; Bin Wang ; John Pouch ; Felix Miranda ; James E. Anderson, et al.
"Performance evaluation of a liquid-crystal-on-silicon spatial light modulator", Opt. Eng. 43(11), 2769-2774 (Nov 01, 2004). ; http://dx.doi.org/10.1117/1.1794706


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