Karp Jason H, Chan Trevor K, Ford Joseph E
Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093-0407, USA
Appl Opt. 2008 Dec 10;47(35):6666-74. doi: 10.1364/ao.47.006666.
We present theory, design, and preliminary experimental studies for a compact wavefront sensor based on lateral shearing interferometry using a binary phase grating, image sensor, and Fourier-based processing. The integrated system places a diffractive element directly onto an image sensor to generate interference fringes within overlapping diffraction orders. The shearing ratio and the interferogram signal-to-noise ratio directly affect the reconstruction accuracy of wavefronts with differing spatial variations. Optimal shearing parameters associated with the autocorrelation of the input encourage placing a spatial light modulator as the diffractive element allowing adaptive wavefront sensing. Experimental results from a fixed-grating system are presented as well as requirements for next-generation adaptive systems.
我们介绍了一种基于横向剪切干涉测量法的紧凑型波前传感器的理论、设计和初步实验研究，该传感器使用二元相位光栅、图像传感器和基于傅里叶的处理方法。该集成系统将衍射元件直接放置在图像传感器上，以在重叠的衍射级内产生干涉条纹。剪切比和干涉图信噪比直接影响具有不同空间变化的波前的重建精度。与输入的自相关相关的最佳剪切参数促使将空间光调制器作为衍射元件放置，从而实现自适应波前传感。给出了固定光栅系统的实验结果以及下一代自适应系统的要求。
