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1 March 2019 Polarization-independent beam-steering system based on liquid-crystal spatial light modulators
Liang Wu, Xiangru Wang, Xiaoxian He, Hongru Guo, Qinggui Tan, Caidong Xiong
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Proceedings Volume 10941, Emerging Liquid Crystal Technologies XIV; 109410F (2019) https://doi.org/10.1117/12.2508207
Event: SPIE OPTO, 2019, San Francisco, California, United States
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.
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Liang Wu, Xiangru Wang, Xiaoxian He, Hongru Guo, Qinggui Tan, and Caidong Xiong "Polarization-independent beam-steering system based on liquid-crystal spatial light modulators ", Proc. SPIE 10941, Emerging Liquid Crystal Technologies XIV, 109410F (1 March 2019); https://doi.org/10.1117/12.2508207
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KEYWORDS
Polarization
Liquid crystals
Beam steering
Phase modulation
Beam splitters
Modulation
LCDs
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