Chinese Optics Letters, 2007, 5 (2): 71, Published Online: Feb. 8, 2007
Focal depth extending using rotational symmetric pupil masks Download: 650次
傅里叶光学 成像系统 焦深 旋转对称 光瞳振幅型掩模板 光瞳相位型掩模板 070.0070 Fourier optics and signal processing 110.0110 Imaging systems 090.1000 Aberration compensation 120.5060 Phase modulation
Abstract
Optical systems are analyzed with three kinds of rotational symmetric pupil masks: annular Gaussian ring mask, supergaussian ring mask, and quartic phase mask. In these masks, the quartic phase mask is found to be the best one to extend focal depth. Point spread function (PSF) and Strehl ratio (SR) are used to evaluate the imaging quality of the system with different defocus parameters. Without decoding needed, the focal depth of the system with quartic phase mask is four times as deep as aberration-free system. Different from the others, it suffers no obvious loss in the light throughput and lateral resolution. With twice focal depth extension, supergaussian ring mask suffers less loss in light throughput and lateral resolution than annular Gaussian ring mask.
Tingyu Zhao, Yanping Chen, Wenzi Zhang, Zi Ye, Feihong Yu. Focal depth extending using rotational symmetric pupil masks[J]. Chinese Optics Letters, 2007, 5(2): 71.