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Polarization-independent beam-steering system based on liquid-crystal spatial light modulators
Author(s): Liang Wu; Xiangru Wang; Xiaoxian He; Hongru Guo; Qinggui Tan; Caidong Xiong
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Paper Abstract

Liquid crystal spatial light modulators (LC-SLMs) are usually polarization sensitive optical elements. In this paper, we propose a polarization-independent beam steering system to overcome the polarization problem of conventional liquid crystal devices by employing two polarization-dependent LC-SLMs, a polarizing beam splitter and a half-wave plate. In this system, two one-dimensional LC-SLMs are aligned orthogonally to deflect the beam in azimuthal and elevation, respectively. This system enables LC-SLMs to work in any polarization state of incident light, and can realize continuous two-dimensional laser beam pointing. Properties of polarization-independence as well as two-dimensional beam steering were mathematically and experimentally verified with a good agreement. Using the well aligned beam steering system, linearly polarized beams in different polarization angle are deflected with high accuracy and efficiency. The measured angular deviations are less than 5 micro-radians to show a high-accuracy beam steering of the system. This polarization-independent beam steering scheme is useful in the applications of nonmechanical laser communication, Lidar, and other LC-based devices.

Paper Details

Date Published: 1 March 2019
PDF: 8 pages
Proc. SPIE 10941, Emerging Liquid Crystal Technologies XIV, 109410F (1 March 2019); doi: 10.1117/12.2508207
Show Author Affiliations
Liang Wu, Univ. of Electronic Science and Technology of China (China)
Univ. of California, San Diego (United States)
Xiangru Wang, Univ. of Electronic Science and Technology of China (China)
Xiaoxian He, Univ. of Electronic Science and Technology of China (China)
Hongru Guo, Univ. of Electronic Science and Technology of China (China)
Qinggui Tan, National Key Lab. of Science and Technology on Space Microwave Technology (China)
Caidong Xiong, Univ. of Electronic Science and Technology of China (China)

Published in SPIE Proceedings Vol. 10941:
Emerging Liquid Crystal Technologies XIV
Liang-Chy Chien, Editor(s)

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