Abstract

The point spread function (PSF) of a wavefront coding (WFC) system with a cubic phase mask is analyzed with a wide viewing angle based on physical optics for what is believed to be the first time. Two coordinate transformations are made to generate a pupil function, from which we obtain the encoded PSF of the WFC system with defocus parameters W020 and object angles α and β. The encoded PSFs are further side extended as the object angles get wider. When αβ<0, the included angle Φ of encoded PSF will skew to an obtuse angle. When αβ=0, Φ remains orthogonal; when αβ>0, Φ will skew to an acute angle. Furthermore, the effect of skew and side extension is even symmetric about W020. As a result, the wide viewing angle has a bad effect on the imaging quality of the WFC system.

© 2007 Optical Society of America

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