Abstract Multistage diffraction of a dispersion-compensated polarization Sagnac interferometer (DCPSI) reduces the fringe visibility of interference fringes generated in a focal plane array, thereby leading to the poor quality of the reconstructed polarization images. In this paper, a double total reflection prism between the DCPSI and imaging lens is added to limit the effect of multistage diffraction and improve the imaging quality. First, the influence of multistage diffraction on the interference fringes and the ratio of fringe amplitude to the background was analyzed. Second, the range of angles of the two right angle prisms was calculated. Simulation and experiment were carried out to prove the superiority of the proposed method. Result shows that the ratio of fringe amplitude to the background increases from 1/5 to 1/3 and from 1/10 to 1/6 in simulation and experiment when a double total reflection prism structure is added respectively. This method can reduce the influence of multistage diffraction on interference fringes and improve the image quality of DCPSI effectively.

中文翻译：

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具有高成像质量的色散补偿偏振 Sagnac 干涉仪

摘要 色散补偿偏振萨格纳克干涉仪（DCPSI）的多级衍射降低了焦平面阵列中产生的干涉条纹的条纹可见度，从而导致重建的偏振图像质量较差。本文在 DCPSI 和成像镜头之间增加了一个双全反射棱镜，以限制多级衍射的影响，提高成像质量。首先，分析了多级衍射对干涉条纹和条纹幅度与背景比的影响。其次，计算两个直角棱镜的角度范围。仿真和实验验证了所提方法的优越性。结果表明，分别加入双全反射棱镜结构后，仿真和实验中条纹幅值与背景的比值分别从1/5增加到1/3，从1/10增加到1/6。该方法可以减少多级衍射对干涉条纹的影响，有效提高DCPSI的图像质量。