基于激光回馈效应的液晶双折射特性测量

发布时间：2018-06-18 14:52

本文选题：液晶材料 + 双折射特性　；参考：《红外与激光工程》2017年03期

【摘要】：准确的双折射特性测量对于液晶的实际应用具有重要意义。研究了液晶材料的工作原理,以激光回馈效应为基础,搭建了各向异性外腔回馈双折射测量系统,对不同驱动电压下液晶的双折射特性进行测量。测量结果表明,各向异性外腔回馈双折射测量系统测量精度在0.3°之内;通过施加0~24V交流电压,液晶材料双折射率在2.74×10~(-1)~2.39×10~(-3)范围内变化,对应各向异性呈现出460°~5°的大范围位相延迟值。电压范围在0.7~2V时,电压-双折射率关系表现出较好的线性度,通过线性拟合对该范围内电压-双折射率关系进行计算,其线性度优于95.5%。液晶材料可以提供稳定的位相延迟,同一电压值下的位相延迟短期重复性优于0.52°,长期重复性优于4.5°。
[Abstract]:Accurate birefringence measurement is of great significance to the practical application of liquid crystal. Based on the laser feedback effect, a feedback birefringence measurement system with anisotropic external cavity is built to measure the birefringence characteristics of liquid crystal at different driving voltages. The measurement results show that the measurement accuracy of the anisotropic external cavity feedback birefringence measurement system is within 0.3 掳, and the birefringence of liquid crystal material varies in the range of 2.74 脳 10 ~ (10) ~ (-1) C ~ (-1) and 2.39 脳 10 ~ (10) ~ (-3) by applying a voltage of 0 ~ 24V, corresponding to a wide range of phase delay of 460 掳~ (5 掳) for the anisotropic external cavity feedback birefringence measurement system. The voltage-birefringence relationship shows a good linearity when the voltage range is 0.7 ~ 2V, and the linearity of the voltage-birefringence relationship in this range is better than that of 95.5 by linear fitting. Liquid crystal materials can provide stable phase delay. The short-term repeatability of phase delay is better than 0.52 掳and the long-term repeatability is better than 4.5 掳at the same voltage.
【作者单位】：清华大学精密仪器系精密测试技术及仪器国家重点实验室;北京航空航天大学仪器科学与光电工程学院;福建福晶科技股份有限公司;
【基金】：国家自然科学基金(61475082)
【分类号】：O753.2

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