The research of methods to improve the control bandwidth for liquid crystal beam steering system

Ya-jing Hao; Yong-mei Huang; Qiong-yan Wu; Wen-ben Xiao

doi:10.1117/12.2034535

21 August 2013 The research of methods to improve the control bandwidth for liquid crystal beam steering system

Ya-jing Hao, Yong-mei Huang, Qiong-yan Wu, Wen-ben Xiao

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 89061T (2013) https://doi.org/10.1117/12.2034535
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

The liquid crystal beam steering technology with low driving voltage, high diffraction efficiency and without the effect of mechanical inertia，is regard as a potential technology in the field of non-mechanical beam steering. Liquid crystal spatial light modulator (LCSLM) can be applied as a beam steering control device in laser communication, and it can realize the programmable control in real time. And compared with fast steering mirror (FSM), which is widely used at present, LCSLM is smaller, lighter and lower power consumptive in a non-mechanical way, so it’s convenient to control. But the system bandwidth is a restricted problem in the research. In this article, the principle of beam steering with LCSLM is introduced firstly. A beam steering bench is set up using reflective pure-phase LCSLM from BNS. The offset of beam spot is detected by the CCD and a classic PI close-loop control experiment is designed to test the system bandwidth. And then the factors which restricted the control bandwidth are analyzed. Considering the effect of the CCD’ frame rate, the PSD with higher frame rate is used in the control system and the data model of the liquid crystal is tested. A controller is designed based on the data model and the bandwidth is improved observably.

Citation Download Citation

Ya-jing Hao, Yong-mei Huang, Qiong-yan Wu, and Wen-ben Xiao "The research of methods to improve the control bandwidth for liquid crystal beam steering system", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 89061T (21 August 2013); https://doi.org/10.1117/12.2034535

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