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Research on Design of Optimum Phase Mask for wave-front Coded Imaging System

Research on Design of Optimum Phase Mask for Wave-front Code...

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2007亚洲光电子会议光学设计与测试分会场

作者： Hui Zhao *1 Huajun Feng 1 Qi Li 1 1State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 P.R.China

wave-front coding is a system level design method which can be used to extend the depth of field of an incoherent optical system. By attaching a phase mask to the aperture, the optical transfer function can not only be made insensitive to misfocus, but also can avoid the isolated zeros caused by defocus. With this modified optical transfer function, a purposely blurred image can be obtained and its corresponding clear one with large depth of focus can be generated through digital processing techniques, such as direct inverse filtering, wiener filtering and maximum entropy restoration and so on. This is why the wave-front coded imaging system is called optical/digital hybrid imaging system as well. The most important part of the system design lies in the design of phase masks. So far, many kinds of phase masks have been suggested;among all those types, two are classical: cubic-phase-mask and logarithmic-phase-mask. However, whether an optimum phase mask exists or not is still a question that is not answered yet. This paper focuses on this question and tries to find one answer. In this paper, considering several critical factors and with the help of a simulation program developed by ourselves, we make a comparison among the performance of different phase masks and finally propose a prototype phase mask whose performance is acceptable in several aspects.

关键词： wave-front coding extended-depth of field phase masks incoherent optical system

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Comprehensive performance analysis of popular odd-symmetric phase masks used for wave-front coded imaging system

Comprehensive performance analysis of popular odd-symmetric ...

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2010亚洲光电子会议光学设计和检验分会场

作者： Hui Zhao and Yingcai Li Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Science No.17 Xinxi Road Xi’an China 710119

wave-front coding was proposed in 1995 and is a powerful system-level technique used to extend the depth of field（DOF） of incoherent imaging *** key to wave-front coding lies in the design of suitable phase masks which make the imaging system insensitive to defocus and defocus-related *** all phase masks used for wave-front coding,odd-symmetric types are dominant and can provide larger extended *** the acceptable degradation of MTF（Modulation Transfer Function） taken as a criterion,optimization procedure is used to obtain the optimum parameters for popular odd-symmetric phase masks and then a comprehensive analysis is carried out by considering four factors:DOF extension capability,sensitiveness to elementary aberrations,PSF（Point Spread Function） shifting effect and restorability of intermediate blurred *** the best of our knowledge,the comprehensive analysis on performance of popular odd-symmetric phase masks,as done in this manuscript,has not been made ***,the work reported here could be considered as a complementary part to the field of wave-front coding.

关键词： wave-front coding depth of field odd-symmetric phase masks incoherent imaging system

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