Design and analysis of the liquid crystal depolarizer based on random phase distribution
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摘要: 为了实现对不同偏振态入射激光的退偏控制，设计了一种具有随机位相分布结构的液晶退偏器。针对胆甾相液晶器件，利用时域有限差分法，对激光通过胆甾相液晶器件的传输问题建立了模型，并通过实验验证了理论模型，分析了激光通过液晶阵列单元后的偏振态变化及偏振态分布特性。仿真分析结果表明，在合适的液晶材料条件和微刻蚀坑的最大厚度条件下，胆甾相液晶器件对于不同偏振角的入射线偏振光均可以实现较好的退偏效果，且适用的谱宽范围较大。Abstract: To control the depolarization of incident laser with different polarization states, a liquid crystal depolarizer with random phase distribution structure is designed. For cholesteric liquid crystal device, a model of laser transmission through cholesteric liquid crystal device is established by using finite-difference time-domain method. The theoretical model is verified by experiments, and the polarization change and polarization distribution characteristics of laser through the liquid crystal array unit are analyzed. The simulation results show that the cholesteric liquid crystal device can achieve good depolarization effect for the linear polarized light with different polarization angles under the conditions of suitable liquid crystal material and maximum thickness of the micro-etching pit, and the applicable spectrum is wide.
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图 4 出射光偏振态的分布
Figure 4. Polarization distribution of emergent light passing through the depolarizer
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