| Citation: | CAO Zong-xin, QIAN Yi-long, LIU Yu-tong, LI Kun, LI Zi-fan, GONG Jun-hao, HU Wu-sheng, ZHANG Da-wei, HONG Rui-jin, MAO Hong-min, LU Huan-jun, FAN Li-na, CAO Zhao-liang. Pointing accuracy research of liquid crystal phase array based on variable period grating method[J]. Chinese Optics. doi: 10.37188/CO.2024-0097
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Liquid crystal optical phased array (LC OPA) is widely used in lidar, laser communication and laser weapons to scan and control laser beams. In order to realize the optimal design of LC OPA and high-precision control of laser beam, this paper focuses on the influence of working wavelength, number of pixels, pixel size and effective grey levels on beam pointing accuracy. Firstly, according to the principle of liquid crystal phase modulation, the effective scanning angle and diffraction efficiency of the period grating and the variable period grating methods are simulated and analyzed. Secondly, assuming the phase modulation is equally divided by the driving voltage, the variation law of the pointing error with the working wavelength, the number of pixels, the pixel size and the effective grey levels is simulated and analyzed, and the multivariable universal formula is derived. Thirdly, the pointing accuracy of the nonuniform phase modulation is simulated, analyzed, and compared with the results of the uniform phase modulation. Finally, the relationship between the effective grey levels and the pointing error is verified by experiments, and the validity of the empirical formula is preliminarily confirmed. The research results can provide a theoretical basis for the design of LC OPA.
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