液晶相位延迟器(LCVR)是一种新型偏振器件,精确标定其光电特性是实现基于该器件的精密光学偏振测量的关键环节.通过建立探测光强与相位延迟值和器件方位角的数学模型,提出了一种基于单偏振器的测量新方法,可快速计算出不同电压作用下的LCVR本征轴方位角和相位延迟值.该方法具有测试结构简单、相位延迟测量过程无需机械旋转、全谱测量速度快的优点.此外,该测量结构便于集成在其它偏振测量结构中,实现LCVR的在线、实时标定.实验结果表明基于上述方法的测试系统,LCVR的相位延迟测量重复性优于5‰,本征轴方位角的测量分辨率优于0.1°.

Liquid crystal phase retarder (LCVR) is a new polarization state control device. Correct calibration of its photoelectric characteristics significantly effects the precise optical polarization measurements based on this device. A new testing method including only one polarizer was proposed by modeling light intensity, phase retardation and eigen-axis azimuth. Without rotating any component, multi-wavelength retardations can be rapidly acquired using this simply structured method. In addition, this new setup can be integrated into other polarization measuring instruments for on-line calibration of LCVR. Experimental results show that the repeatability of measured retardations is better than 5‰, while the resolution of eigen-axis azimuth is better than 0.1°.