| 薛鹏,王志斌,张瑞,李克武.液晶可变相位延迟器相位延迟的精确定标[J].光电子激光,2016,27(8):798~803 |
| 液晶可变相位延迟器相位延迟的精确定标 |
| Accurate calibration of phase retardation based on the liquid crystal variab le retarder |
| 投稿时间：2016-01-05 |
| DOI： |
| 中文关键词: 液晶可变相位延迟器(LCVR) 相位延迟 初始相位延迟定标 最小二乘法 |
| 英文关键词:liquid crystal variable retarder (LCVR) phase retardation calibration of i nitial phase retardation least square method |
| 基金项目:国家自然科学基金仪器专项基金(61127015)、国际科技合作项目(2013DFR10150)和山 西省青年科技研究基金(2014021012)资助项目 |
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| 中文摘要: |
| 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671 nm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 1.4 nm,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。 |
| 英文摘要: |
| In order to use liquid crystal variable retarder (LCVR) to measure the p hase retardation of light,the calibration method of phase retardation is studied.First,the factors that res ult in the change of phase retardation are analyzed in theory.Then,the retardance for 405nm,532nm,632nm and 641nm l aser is measured by the light intensity method based on the Stokes parameters wh ich changes with the driving voltage.Besides,the change of normalized phase retardation is only related to the driving voltage is verified by experiment.Next,the least square method is presented to measure the initial phase retardation for differen t wavelengths,and the calibration equation of initial phase retardation is calculated when different wavelengt hs of light incident to the LCVR.A 671nm laser is used to demonstrate the equation and the results show that the stardard deviation is 1.4nm between the initial phase retardation calculated by the calibration equation and the rea l value,and the maximal relative error between them is 0.18% under any driving voltage.Finally,compared with other methods of calibrating initial phase retardation,the least square method is accurate and re liable. |
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