Appl Opt. 2023 Apr 20;62(12):3142-3148. doi: 10.1364/AO.483989.
The snapshot imaging polarimeters (SIPs) using spatial modulation have gained increasing popularity due to their capability of obtaining all four Stokes parameters in a single measurement. However, the existing reference beam calibration techniques cannot extract the modulation phase factors of the spatially modulated system. In this paper, a calibration technique based on a phase-shift interference (PSI) theory is proposed to address this issue. The proposed technique can accurately extract and demodulate the modulation phase factors through measuring the reference object at different polarization analyzer orientations and performing a PSI algorithm. Using the snapshot imaging polarimeter with modified Savart polariscopes as an example, the basic principle of the proposed technique is analyzed in detail. Subsequently, the feasibility of this calibration technique was demonstrated by a numerical simulation and a laboratory experiment. This work provides a different perspective for the calibration of a spatially modulated snapshot imaging polarimeter.
基于相移干涉（PSI）理论的标定技术，能够通过测量不同偏振光分析器取向的参考物并执行 PSI 算法，精确地提取和解调调制相位因子。以改进的萨伐尔偏光镜为快照成像偏振仪为例，详细分析了该技术的基本原理。随后，通过数值模拟和实验室实验验证了该标定技术的可行性。这项工作为空间调制快照成像偏振仪的标定提供了新的思路。
