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Opt Lett. 2009 Apr 15;34(8):1171-3.

Design of a complex filter for depth of focus extension.

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Thales Research & Technology, RD 128, 91767 Palaiseau Cedex, France.


Different methods such as axilens and binary-phase filter have been investigated to improve the depth of focus. A method is proposed to calculate an amplitude-phase pupil filter and obtain the desired distribution of intensity along the optical axis. It produces a narrow spot with a uniform intensity level over a large depth of focus, comparable to the performance obtainable with binary-phase filters. This filter is of particular interest for applications where very low intensity fluctuations along the focus range are required.

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