基于光瞳分割和角剪切的成像偏振光谱技术

Technology of polarization interference imaging spectral based on pupil division and angle shear

基于光瞳二分割及Wollaston棱镜角剪切、Savart板横向剪切干涉的原理,提出一种同时获取图像、偏振态及光谱信息的新技术.装置没有任何机械运动部件和电调谐器件,在单一面阵探测器的四个分区同时获得四种线偏振态的干涉图(两幅差分偏振光谱图),系统工作在推扫模式.在详细论述装置组成的基础上,从系统成像的原理出发,深入分析了系统中棱镜主截面方位角的相互位置关系对输出光强的影响,并对系统参数进行了优化,推导出干涉条纹强度分布的表达式,并利用计算机数值仿真,验证了方案的准确性和可行性.为新型成像光谱仪的设计和工程化应用提供了重要的理论依据和实践指导.

With the combination of pupil division, Wollaston prism angle shear and Savart plate lateral shear interference, a new technology that can aquire the message of imaging, polarization and spectrum simultaneously is presented. The system works at the pushing mode with neither mechanical movable nor electrically tunable device, and four quarters of the single charge-coupled device can get four interferograms of different polarization states （two polarization-difference spectral imagings）. The device is discussed in detail, and the relationship between azimuth of the prism principal cross section and the output light intensity is analyzed, and then system parameters are optimized. In the paper, we derive the interference fringe intensity distribution formula, use computer numerical simulation to verify the feasibility and accuracy of this method, and thus provide an important theory basis and the practice instruction for designing a new type of imaging spectrometer and its engineering applications.