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Characterizing a liquid crystal spatial light modulator at oblique incidence angles using the self-interference method

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Abstract

The phase modulation characteristics of a reflective liquid crystal (LC) spatial light modulator (SLM) under oblique incidence are studied by using our proposed self-interference method. The experimental setup of the method is very simple and has good robustness to mechanical vibrations. By changing the gray value of the combined grayscale loaded on the LC-SLM, different sheared fringe patterns, generated by the interference between the constant phase-modulated beam and the +1-order diffracted beam of the blazed grating, can be obtained. The amount of phase modulation of the LC-SLM is obtained by subtracting the phase of the two side lobes in the frequency domain. By turning the turntable where the SLM is mounted, the phase modulation characteristics at different incident angles can be measured. The experimental results show that the phase modulation curves do not change significantly with the small angle. When the angle is large (i.e. larger than 10°), the phase modulation curves become different, especially for the high gray levels. With the increase of the incident angle, the phase modulation depth is reduced. The results indicate that the incident angle plays an important role in the performance of the phase modulation of an LC-SLM.

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DOI:10.3788/col201816.090701

所属栏目:Fourier optics and signal processing

基金项目:This work was financially supported by the National Natural Science Foundation of China (No. 51705404), the China Postdoctoral Science Foundation (No. 2016M602806), and the Fundamental Research Funds for the Central Universities (No. xjj2017093).

收稿日期:2018-04-09

录用日期:2018-08-07

网络出版日期:2018-08-31

作者单位    点击查看

Zixin Zhao:State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yiying Zhuang:State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Zhaoxian Xiao:Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621000, China
Hangying Zhang:State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Chen Fan:State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Hehui Geng:State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Hong Zhao:State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

联系人作者:Zixin Zhao(zixinzhao@xjtu.edu.cn)

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引用该论文

Zixin Zhao, Yiying Zhuang, Zhaoxian Xiao, Hangying Zhang, Chen Fan, Hehui Geng, Hong Zhao, "Characterizing a liquid crystal spatial light modulator at oblique incidence angles using the self-interference method," Chinese Optics Letters 16(9), 090701 (2018)

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