Gladish James C, Duncan Donald D
Appl Opt. 2014 Jun 20;53(18):3982-92. doi: 10.1364/AO.53.003982.
It is well known that in liquid crystal (LC)-based active polarimetry, alignment and temperature effects impact polarimeter performance. Practically speaking, when constructing a polarimetric measurement system from LC variable retarders (LCVRs), unavoidable alignment and temperature uncertainties will occur, leading to systematic error that propagates to the Mueller matrix. Typical calibration methods use only a single metric to assess polarimeter performance (the condition number) and often ignore the relationship between systematic error and specific Mueller matrix elements. Here we explore alignment and temperature effects in a Stokes generator and polarimeter, each consisting of two LCVRs, through a series of simulations to calibrate the polarimeter and measure the Mueller matrix of air. We achieve this by modifying an existing LCVR model to incorporate alignment and temperature effects. This new approach offers insight into employing LCVRs individually and associating particular Mueller matrix element error with specific LCVR effects.
众所周知，在基于液晶（LC）的有源旋光法中，取向和温度效应会影响旋光仪的性能。实际上，当用液晶可变延迟器（LCVR）构建旋光测量系统时，不可避免地会出现取向和温度的不确定性，从而导致系统误差传播到穆勒矩阵。典型的校准方法仅使用单一指标来评估旋光仪性能（条件数），并且常常忽略系统误差与特定穆勒矩阵元素之间的关系。在此，我们通过一系列模拟来校准旋光仪并测量空气的穆勒矩阵，以探究由两个LCVR组成的斯托克斯发生器和旋光仪中的取向和温度效应。我们通过修改现有的LCVR模型以纳入取向和温度效应来实现这一目标。这种新方法有助于深入了解单独使用LCVR以及将特定穆勒矩阵元素误差与特定LCVR效应相关联的情况。
