%0 Journal Article
%T The extension effect of point spread function in wavefront coding system due to off-axis illumination<br>倾斜入射的波前编码系统的点扩散函数扩大效应分析
%A Zhao Ting-Yu
%A Ye Zi
%A Zhang Wen-Zi
%A Yu Fei-Hong
%A <br>赵廷玉
%A 叶子
%A 张文字
%A 余飞鸿
%J 物理学报
%D 2008
%I 
%X The off-axis illumination pupil function of the wavefront coding system with cubic phase mask is analyzed by coordinate-rotation for the first time. The approximate expression of the pupil function shows that off-axis illumination brings about the extension effect of cubic phase and defocusing. The extension effect is independent of the sign of the incident angle; however, the extension effect will get larger as the absolute value of the angle increases. This causes a decrease in modulation transfer function (MTF) and the extension effects on both sides of the point spread function (PSF) envelope. When the off-axis illumination is in the tangential plane, the extension effects of cubic phase and defocusing in y direction is larger than that in x direction, which results in larger extension of PSF and lower MTF in the y direction. When off-axis illumination is in the sagittal plane, the extension effects of cubic phase and defocusing in x direction is larger than that in the y direction, which results in larger extension of PSF and lower MTF in x direction.
%K off-axis illumination
%K wavefront coding
%K extension effect of cubic phase
%K extension effect of defocus<br>倾斜入射
%K 波前编码
%K 三次相位扩大效应
%K 离焦扩大效应
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=060F8E647307A456C43A0DA2A81A2C70&yid=67289AFF6305E306&vid=11B4E5CC8CDD3201&iid=CA4FD0336C81A37A&sid=1E41DF9426604740&eid=EF27C460877D3C9F&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=8