All-Optical Extended Focus Imaging System

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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


A lens in conjunction with a multiplexed set of Fresnel lenses (FL) can significantly reduce the sensitivity of an optical system to defocus aberrations. Each FL is considered as a corrective lens with a slightly different focal length. Thus for a fixed detector plane, there is a set of object planes for which the composite lens provides perfect imaging. The various FLs are multiplexed using code division multiple access procedure. The resulting image is analyzed in this paper. One obtains a significant improvement of depth of field, albeit coupled with a reduction of resolution and image contrast.

Original languageEnglish
Pages (from-to)194-195
Number of pages2
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4829 I
StatePublished - 2003
Event19th Congress of the International Commisssion for Optics Optics for the Quality of Life - Firenze, Italy
Duration: 25 Aug 200230 Aug 2002


  • CDMA
  • Defocus correction
  • Extended depth of field
  • Wave front coding


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