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Proceedings Paper

Performance optimization of liquid crystal optical phased array beam based on stochastic parallel gradient descent algorithm
Author(s): Lan-ting Li; Chun-yang Wang; Guang-ping Zhang; Hong-wei Shi; Qi-feng Niu
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Paper Abstract

Affected by voltage quantification, manufacture technology and environment temperature, the actual deflection accuracy and diffraction efficiency of liquid crystal optical phased arrays (LC-OPA) are in error with the ideal situation when the beam deflected. In this paper, we studied the method of improving the deflection performance of LC-OPA based on stochastic parallel gradient descent (SPGD) algorithm, and choose Strehl ratio (SR) as the performance evaluation function for simulation experiments. We analyzed the influence of the disturbance amplitude δ, the gain coefficient γ and the number of periodic electrodes N on the performance optimization of the SPGD algorithm in the LC- OPA beam. Draw the conclusion: When the number of periodic electrodes N is within a certain range, appropriate adjustment of the disturbance amplitude δ and the gain coefficient γ can achieve better optimization effects, and the larger the deflection angle, the better the optimization effect. When the number of periodic electrodes N is 4, the amplitude of disturbance δ is 0.0009, and the gain coefficient γ is 0.1, the ideal optimization effect of SR of 0.82 can be achieved, which provides a theoretical basis for improving the large-angle deflection precision and diffraction efficiency of LC-OPA.

Paper Details

Date Published: 16 October 2019
PDF: 6 pages
Proc. SPIE 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 112051X (16 October 2019); doi: 10.1117/12.2541889
Show Author Affiliations
Lan-ting Li, Changchun Univ. of Science and Technology (China)
Chun-yang Wang, Changchun Univ. of Science and Technology (China)
Xi'an Technological Univ. (China)
Guang-ping Zhang, Inner Mongolia institute of Metal Materials (China)
Hong-wei Shi, Changchun Univ. of Science and Technology (China)
Qi-feng Niu, Changchun Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 11205:
Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019)
Anand Asundi; Motoharu Fujigaki; Huimin Xie; Qican Zhang; Song Zhang; Jianguo Zhu; Qian Kemao, Editor(s)

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