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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。
In order to accurately measure the phase delay of a light wave using a liquid crystal variable retarder (LCVR), an accurate calibration of the phase delay of the light wave by LCVR based on the Stokes parameter measurement and the least square method method. Based on the theoretical analysis of the factors that affect the phase delay variation after LCVR, the phase delay of incident light with wavelength of 405, 532, 632 and 641 nm is measured with the light intensity method based on Stokes parameter measurement respectively. The phase delay after the change is only related to the driving voltage. Based on the least-square method, the initial phase retardation of different wavelengths is calibrated. The calibration equation of the initial phase retardation of LCFR at different wavelengths is deduced. Using 671nm laser The calibration equation was verified. The initial phase delay of the 671nm wavelength solved by the calibration equation was 1.4nm, and the actual measurement value of the phase delay and the maximum value of the formula calibration were the maximum at any driving voltage The relative error is 0.18%. Finally, by comparing with other calibration methods, further illustrate the accuracy and reliability of calibration using this method.