Rodriguez-Zurita Gustavo, Meneses-Fabian Cruz, Toto-Arellano Noel-Ivan, Vázquez-Castillo José F, Robledo-Sánchez Carlos
Benemérita Universidad Autónoma de Puebla, Facultad de Ciencias Físico-Matemáticas Apartado Postal 1152, Puebla PUE 72000, México.
Opt Express. 2008 May 26;16(11):7806-17. doi: 10.1364/oe.16.007806.
An experimental setup for optical phase extraction from 2-D interferograms using a one-shot phase-shifting technique able to achieve four interferograms with 90 degrees phase shifts in between is presented. The system uses a common-path interferometer consisting of two windows in the input plane and a phase grating in Fourier plane as its pupil. Each window has a birefringent wave plate attached in order to achieve nearly circular polarization of opposite rotations one respect to the other after being illuminated with a 45 degrees linear polarized beam. In the output, interference of the fields associated with replicated windows (diffraction orders) is achieved by a proper choice of the windows spacing with respect to the grating period. The phase shifts to achieve four interferograms simultaneously to perform phase-shifting interferometry can be obtained by placing linear polarizers on each diffraction orders before detection at an appropriate angle. Some experimental results are shown.
本文介绍了一种用于从二维干涉图中提取光学相位的实验装置，该装置采用单次相移技术，能够实现四张干涉图，且相邻干涉图之间的相移为90度。该系统使用共路干涉仪，其输入平面有两个窗口，傅里叶平面有一个相位光栅作为光瞳。每个窗口都附着有一个双折射波片，以便在用45度线偏振光束照射后，实现彼此相反旋转方向的近圆偏振。在输出端，通过适当选择窗口间距与光栅周期的关系，实现与复制窗口（衍射级）相关的场的干涉。通过在检测前以适当角度在每个衍射级上放置线性偏振器，可以获得同时实现四张干涉图以进行相移干涉测量的相移。文中展示了一些实验结果。
