Chinese Optics Letters, 2007, 5 (2): 71, Published Online: Feb. 8, 2007  

Focal depth extending using rotational symmetric pupil masks Download: 650次

Author Affiliations
State Key Laboratory of Modern Optical Instrumentation, Optical Engineering Department, Zhejiang University, Hangzhou 310027
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.

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