The wavefront coding technique is used to enlarge the depth of field (DOF) of incoherent imaging systems. The key to wavefront coding lies in the design of suitable phase masks. To date, numerous kinds of phase masks are proposed. However, further understanding is needed regarding phase mask with its phase function being in a standard sinusoidal form. Therefore, the characteristics of such a phase mask are studied in this letter. Deriving the defocused optical transfer function (OTF) analytically proves that the standard sinusoidal phase mask is effective in extending the DOF, and actual experiments confirm the numerical results. At the same time, with the Fisher information as a criterion, the standard sinusoidal phase mask shows a higher tolerance to focus errors (especially severe focus errors) than the classical cubic phase mask.
Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China
推荐引用方式 GB/T 7714
Zhao, Hui,Li, Yingcai. Analytical and experimental demonstration of depth of field extension for incoherent imaging system with a standard sinusoidal phase mask[J]. CHINESE OPTICS LETTERS,2012,10(3):031101.
APA
Zhao, Hui,&Li, Yingcai.(2012).Analytical and experimental demonstration of depth of field extension for incoherent imaging system with a standard sinusoidal phase mask.CHINESE OPTICS LETTERS,10(3),031101.
MLA
Zhao, Hui,et al."Analytical and experimental demonstration of depth of field extension for incoherent imaging system with a standard sinusoidal phase mask".CHINESE OPTICS LETTERS 10.3(2012):031101.
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