液晶相位可变延迟器(LCVR)是一种利用液晶电控双折射效应进行工作的波片,通过改变电场来改变入射光的相位, 因其相位延迟与电压、波长、温度等因素有关,使用前需要进行严格的标定。针对LCVR的标定,提出了一种基于Stokes矢量测量的LCVR标定方法,建立了系 统Stokes矢量与LCVR相位延迟量之间的函数关系,通过偏振态测量仪测量待测系统出射光的Stokes矢量,进而求解出LCVR的相位延迟量。通过与光强法进行 对比分析,验证了Stokes矢量法的正确性,并且,较之光强法测量更加简便,系统不再需要检偏器,避免了透光轴校准和光强值测量带来的误差；最后分析了电压、 入射光的偏振角度、入射光波长,以及温度等对LCVR 相位延迟量的影响。

Liquid crystal variable retarders(LCVR), a kind of wave plate using liquid crystal birefringence effect, can modulate the incident light phase by changing the electric field. It needs to be calibrated accurately advancely because of its phase delay related to the voltage, wavelength, temperature and other factors. The calibration method of LCVR based on Stokes vector measurement was proposed, and the functional relationship between the system stokes vector and the LCVR phase delay was established. The Stokes vector of light was measured by polarization measurement instrument, then the phase delay of LCVR was calculated. The proposed Stokes vector method was compared with the two traditional light intensity calibration methods, and the correctness of the new method was verified. Stokes vector method is more simple and convenient, the system no longer needs analyzer, and avoided the error from the transmission axis calibration and light intensity measurement. Finally, the influences of voltage, angle of polarization of incident light, incident wavelength and temperature on the phase delay of LCVR were analysed.