All-optical extended depth of field imaging system

Eyal Ben-Eliezer, Zeev Zalevsky, Emanuel Marom, Naim Konforti

Research output: Contribution to journalArticlepeer-review

Abstract

We describe a novel approach whereby a phase mask consisting of several spatially multiplexed Fresnel lenses (FL) positioned in the pupil of an imaging system increases the depth of field (DOF) significantly. Each FL acts essentially as a corrective lens with a slightly different focal length. Keeping the detector plane in a fixed location, each individual FL provides perfect imaging for different object planes, with a certain DOF tolerance around it. Allowing the individual DOFs to overlap slightly, the resulting composite DOF of the imaging system is highly extended. Nevertheless, the increased DOF is coupled with a reduction in image contrast and resolution. System analysis and simulation results are presented.

Original languageEnglish
Pages (from-to)S164-S169
JournalJournal of Optics A: Pure and Applied Optics
Volume5
Issue number5
DOIs
StatePublished - Sep 2003

Keywords

  • Extended depth of field
  • Imaging systems
  • MTF
  • OTF

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