College of Electronic Information, Sichuan University, Chengdu, Sichuan 610064, China.
Opt Lett. 2012 Oct 1;37(19):3927-9. doi: 10.1364/OL.37.003927.
A simple and compact point-diffraction interferometer with circular common-path geometry configuration is developed. The interferometer is constructed by a beam-splitter, two reflection mirrors, and a telescope system composed by two lenses. The signal and reference waves travel along the same path. Furthermore, an opaque mask containing a reference pinhole and a test object holder or test window is positioned in the common focal plane of the telescope system. The object wave is divided into two beams that take opposite paths along the interferometer. The reference wave is filtered by the reference pinhole, while the signal wave is transmitted through the object holder. The reference and signal waves are combined again in the beam-splitter and their interference is imaged in the CCD. The new design is compact, vibration insensitive, and suitable for the measurement of moving objects or dynamic processes.
提出了一种具有共路环形光路结构的简单紧凑的点衍射干涉仪。该干涉仪由分光镜、两个反射镜和由两个透镜组成的望远镜系统构成。信号波和参考波沿同一路径传播。此外，在望远镜系统的共焦平面上放置一个包含参考针孔和被测物体支架或测试窗口的不透明掩模。物波被分成两束，沿干涉仪的相反路径传播。参考波被参考针孔滤光，而信号波穿过物体支架传输。参考波和信号波再次在分光镜中组合，并在 CCD 中对它们的干涉进行成像。该新设计紧凑、抗振且适用于测量运动物体或动态过程。
