中国激光, 2019, 46 (8): 0801002, 网络出版: 2019-08-13
相位型光寻址空间光调制器稳定性分析 下载: 1110次
Stability Analysis for Optically-Addressed Phase-Only Spatial Light Modulator
空间光调制器 电压波形 垂直偏振 相位波动 optical devices spatial light modulator voltage waveform vertical polarization phase fluctuation
摘要
基于光寻址空间光调制器的等效电路仿真及稳定性测试实验,对纯相位型光寻址空间光调制器的稳定性进行分析和优化。结果表明,光阀液晶层的电压脉冲波形会引起光寻址空间光调制器对读出光的相位调制波动,而驱动电压频率与写入光强度同时影响相位调制波动幅度及相位调制量。由实验测量得到的光寻址空间光调制器的相位改变量曲线可知:当驱动电压周期比响应时间小95%时,最大相位改变量对应的相位波动率减小为0.35%,但此时相位调制能力仅为0.8λ ;通过优化光寻址空间光调制器驱动条件参数,可获得1λ 的相位调制能力,同时最大相位改变量对应的相位波动率为1%。
Abstract
The working stability of an optically-addressed phase-only spatial light modulator is analyzed and optimized based on the equivalent circuit simulation of the optically-addressed spatial light modulator and an experiment to measure its stability. The results demonstrate that the voltage waveform on the liquid crystal layer of the light valve causes the phase fluctuation of the readout light modulated by the optically-addressed spatial light modulator and that the driving voltage frequency and write light intensity simultaneously affect the modulator's phase fluctuation amplitude and phase change capability. Based on the aforementioned analysis and by testing the phase change curves of the optically-addressed spatial light modulator, it is found that when the driving voltage period is 95% less than the response time, the phase fluctuation rate corresponding to the maximum phase change of the phase modulation curve is reduced to 0.35%; however, the phase modulation capability is only 0.8λ. By optimizing the driving condition parameters of the optically-addressed spatial light modulator, a phase modulation capability of 1λ is obtained, and the phase fluctuation rate corresponding to the maximum phase change of the phase modulation curve is 1%.
裴丽丽, 黄大杰, 范薇. 相位型光寻址空间光调制器稳定性分析[J]. 中国激光, 2019, 46(8): 0801002. Lili Pei, Dajie Huang, Wei Fan. Stability Analysis for Optically-Addressed Phase-Only Spatial Light Modulator[J]. Chinese Journal of Lasers, 2019, 46(8): 0801002.