Phase modulation of liquid crystal spatial light modulator measured by a twyman-green interferometer

被引：3

作者：

Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150008, China ^{[1
]}

不详 ^{[2
]}

机构：

[1] Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology

[2] Department of Mechanical and Electrical Engineering, Harbin University of Science and Technology

来源：

Zhongguo Jiguang | 2008年 / 9卷 / 1360-1364期

关键词：

Measurement; Phase modulation; Spatial light modulator; Twyman-Green interferometer;

D O I：

10.3788/CJL20083509.1360

中图分类号：

学科分类号：

摘要：

In order to evaluate the performance of a reflective 256 pixel × 256 pixel phase-only liquid crystal spatial light modulator (LC SLM) from American BNS Company, interference measurements are proposed on the characteristics of phase modulation using a Twyman-Green interferometer. Experimental results indicate that the relation between phase and gray level is nonlinear. A linear look up table is established by inverse interpolation to correct the nonlinearity for this device. The nonlinearity decreases to 2.85% from 17.23%. The phase difference between the centre and the edge is 0.22π on the equal gray level and the root-mean-square error of phase modulation for the centre is 4 times of that for the edge, which shows the phase modulation for this device is nonuniform and the phase error for the centre should be corrected in wave-front control application.

引用

页码：1360 / 1364

页数：4

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