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从高斯光束基本理论出发，分析了双光束的非交迭效应对ＭａｃｈＺｅｈｎｄｅｒ极化干涉仪性能的影响，提出了改善极化干涉仪性能的途径，并在实验中得到了验证．用自制的有衬底的线栅极化器组装成的ＭａｃｈＺｅｈｎｄｅｒ极化干涉仪，在波长为３３７μｍ（８９０ＧＨｚ）的条件下，测得调制比优于１９ｄＢ，插入损耗小于１ｄＢ．
Based on the basic theory of Gaussian beam, the influence of the non-overlap effect of the two beams on the performance of the Mach-Zehnder polarization interferometer is analyzed. The way to improve the performance of the polarization interferometer is proposed and verified in the experiment. Mach-Zehnder polarization interferometer with self-made substrate grid polarizer was used. The modulation ratio was better than 19dB and the insertion loss was less than 1dB at the wavelength of 337μm (890GHz).