Wavefront coding is a powerful technique that can be used to extend the depth of field of an incoherent imaging system. By adding a suitable phase mask to the aperture plane, the optical transfer function of a conventional imaging system can be made defocus invariant. Since 1995, when a cubic phase mask was first suggested, many kinds of phase masks have been proposed to achieve the goal of depth extension. In this Letter, a phase mask based on sinusoidal function is designed to enrich the family of phase masks. Numerical evaluation demonstrates that the proposed mask is not only less sensitive to focus errors than cubic, exponential, and modified logarithmic masks are, but it also has a smaller point-spread-function shifting effect. (C) 2010 Optical Society of America
Chinese Acad Sci, Xian Inst Opt & Precis Mech, Space Opt Lab, Xian 710119, Peoples R China
推荐引用方式 GB/T 7714
Zhao, Hui,Li, Yingcai. Optimized sinusoidal phase mask to extend the depth of field of an incoherent imaging system[J]. OPTICS LETTERS,2010,35(2):267-269.
APA
Zhao, Hui,&Li, Yingcai.(2010).Optimized sinusoidal phase mask to extend the depth of field of an incoherent imaging system.OPTICS LETTERS,35(2),267-269.
MLA
Zhao, Hui,et al."Optimized sinusoidal phase mask to extend the depth of field of an incoherent imaging system".OPTICS LETTERS 35.2(2010):267-269.
; Li, Yingcai
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