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Design of a complex filter for depth of focus extension

Abstract : 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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Frédéric Diaz, François Goudail, Brigitte Loiseau, Jean-Pierre Huignard. Design of a complex filter for depth of focus extension. Optics Letters, Optical Society of America - OSA Publishing, 2009, 34 (8), pp.1171-1173. ⟨hal-00746928⟩

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