Abstract
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.
© 2012 Chinese Optics Letters
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