液晶可变相位延迟器相位延迟的精确定标

发布时间：2018-01-01 18:18

本文关键词：液晶可变相位延迟器相位延迟的精确定标　出处：《光电子·激光》2016年08期 　论文类型：期刊论文

【摘要】：为了能够利用液晶可变相位延迟器(LCVR,liquid crystal variable retarder)对光波的相位延迟进行准确测量,提出一种基于Stokes参量测量光强法和最小二乘法的LCVR对光波相位延迟的精确定标方法。从理论分析光波经LCVR后影响相位延迟变化的因素,采用基于Stokes参量测量的光强法分别对波长为405、532、632和641nm入射光相位延迟随电压的变化进行测量,并实验验证归一化后的相位延迟变化只与驱动电压有关;基于最小二乘法对不同波长的初始相位延迟量进行定标研究,导出不同波长入射光经LCVR后初始相位延迟量定标方程,用671nm波长的激光对定标方程进行了验证,经定标方程求解的671nm波长的初始相位延迟量与实际值偏差为1.4nm,且任一驱动电压下,相位延迟量的实际测量值与公式定标计算值最大相对误差为0.18%。最后,通过与其他定标方法的比较,进一步说明采用本文方法定标的精确性和可靠性。
[Abstract]:In order to measure the phase delay of light wave accurately, the liquid crystal variable phase delay device LCVRliquid crystal variable retarder can be used. An accurate calibration method of optical wave phase delay by LCVR based on Stokes parameter measurement method and least square method is proposed. The factors influencing the phase delay of light wave after LCVR are analyzed theoretically. The light intensity method based on Stokes parameter measurement is used to measure the phase delay of incident light at wavelength of 405,532,632 nm and 641 nm respectively. The results show that the normalized phase delay is only related to the driving voltage. Based on the least square method, the initial phase delay of different wavelength is calibrated, and the initial phase delay calibration equation of different wavelength incident light after LCVR is derived. The calibration equation is verified by using the laser at 671nm wavelength. The initial phase delay of 671nm wavelength is 1.4 nm and the deviation between the initial phase delay and the actual value is 1.4 nm under any driving voltage. The maximum relative error between the actual measured value of phase delay and the calculated value of formula calibration is 0.18. Finally, by comparing with other calibration methods, the accuracy and reliability of calibration using this method are further explained.
【作者单位】：中北大学电子测试技术重点实验室山西省光电信息与仪器工程技术研究中心;中北大学理学院;
【基金】：国家自然科学基金仪器专项基金(61127015) 国际科技合作项目(2013DFR10150) 山西省青年科技研究基金(2014021012)资助项目
【分类号】：O753.2
【正文快照】： 1引言向列型液晶可变相位延迟器(LCVR)是根据具有单轴双折射特性的各向异性液晶分子易受电场、磁场的影响而发生偏转,从而使得入射光波的相位受到调制而制成的偏振光学器件[1,2]。LCVR与弹光、电光等其他相位延迟器件[3,4]相比,具有调制电压低、入射角度对延迟效果影响不大[5]

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