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Chin. Opt. Lett.
 Home  List of Issues    Issue 09 , Vol. 16 , 2018    10.3788/COL201816.090701


Characterizing a liquid crystal spatial light modulator at oblique incidence angles using the self-interference method
Zixin Zhao1, Yiying Zhuang1, Zhaoxian Xiao2, Hangying Zhang1, Chen Fan1, Hehui Geng1, and Hong Zhao1
1 State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, [Xi’an Jiaotong University], Xi’an 71 0049, China
2 [Institute of Systems Engineering, China Academy of Engineering Physics], Mianyang 62 1000, China

Chin. Opt. Lett., 2018, 16(09): pp.090701

DOI:10.3788/COL201816.090701
Topic:Fourier optics and signal processing
Keywords(OCIS Code): 070.6120  120.5060  120.5050  050.1950  

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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Received:2018/4/9
Accepted:2018/8/7
Posted online:2018/8/31

Get Citation: Zixin Zhao, Yiying Zhuang, Zhaoxian Xiao, Hangying Zhang, Chen Fan, Hehui Geng, and Hong Zhao, "Characterizing a liquid crystal spatial light modulator at oblique incidence angles using the self-interference method," Chin. Opt. Lett. 16(09), 090701(2018)

Note: 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).



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