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Rational phase mask to extend the depth of field in optical-digital hybrid imaging systems
Feng Zhou1, Guangwei Li, Haitao Zhang
1Department of Precision Instrument and Mechanology, Tsinghua University, Beijing, China. zhou-f@mails.tsinghua.edu.cn
Optics Letters
|February 3, 2009
Abstract:
We propose a novel phase mask called the rational phase mask (RPM) to extend the depth of field in optical-digital hybrid imaging systems. Using the invariance to defocus of the modulation transfer function as the merit function, we adopt the simulated annealing algorithm to optimize the RPM together with the other three existing phase masks. Numerical comparisons prove the RPM's superiority.

