Bian Dian, Kim Daehee, Kim Byunggi, Yu Liandong, Joo Ki-Nam, Kim Seung-Woo
Appl Opt. 2020 Oct 1;59(28):9067-9074. doi: 10.1364/AO.402903.
In this investigation, we describe a simple cyclic radial shearing interferometer for single-shot wavefront sensing. Instead of using the telescope lens system used in typical radial shearing interferometry, a single lens is used to generate two diverging radial shearing beams. This simple modification leads to the advantages of conveniently adjusting the radial shearing ratio, compactness of the system, and practical ease of alignment. With the aid of a polarization pixelated CMOS camera, the spatial phase-shifting technique is used to extract the phase with a single image. The most important feature is the fringe contrast enhancement by reducing the aberrations caused by the complicated optical system even though an incoherent light is used. The experimental results show the fringe contrast enhancement is at least 0.1 better than that of the conventional method, and the wavefronts are properly reconstructed with less than 0.071 root-mean-squared wavefront error regardless of the coherence of the light.
在本研究中，我们描述了一种用于单次波前传感的简单环形径向剪切干涉仪。与典型径向剪切干涉测量中使用的望远镜透镜系统不同，该干涉仪使用单个透镜生成两束发散的径向剪切光束。这种简单的改进带来了便于调节径向剪切比、系统紧凑以及实际对准容易等优点。借助偏振像素化互补金属氧化物半导体（CMOS）相机，利用空间相移技术通过单幅图像提取相位。最重要的特点是，即使使用非相干光，也能通过减少复杂光学系统引起的像差来增强条纹对比度。实验结果表明，条纹对比度增强至少比传统方法高0.1，并且无论光的相干性如何，都能以小于0.071的均方根波前误差正确重建波前。
