The mode discrimination and loss characteristics of unstable optical resonators with higher Fresnel number are analysed using theories of geometric-optics and interferometer.

采用几何光学和干涉仪理论，分析了较大菲涅尔数情况下，非稳腔内不同波型的区分方法以及它们彼此间的损耗率差异；

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The measurement stability and repetitiveness of the laser interferometer is improved by means of convenient mode inhibiting technique.

利用共模抑制技术，提高了干涉系统的测量稳定性和重复性。

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An absolute distance heterodyne interferometer using a dual longitudinal mode he ne laser is proposed.

提出了一种采用双纵模稳频激光器的新型绝对距离测量外差干涉仪。

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