Infrared imaging lens with extended depth of focus

Zhiqiang Liu, Angel Flores, Michael R. Wang, Jame J. Yang

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


An infrared imaging lens that produces beams with long focal depth whilst preserving the entire aperture for full light capturing and high transverse resolution is presented. It is a diffractive optical element that generates a long range of pseudo-non-diffractive rays. The design technique is based on the conjugate-gradient algorithm. The surface relief pattern was generated on a thick film photoresist and then the pattern was transferred to germanium substrate. Preliminary experimental results demonstrated four times improvement in depth of focus at 10.6 μm wavelength.

Original languageEnglish (US)
Article number89
Pages (from-to)841-848
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART II
StatePublished - 2005
EventInfrared Technology and Applications XXXI - Orlando, FL, United States
Duration: Mar 28 2005Apr 1 2005


  • Diffractive optics
  • Extended depth of focus
  • Infrared imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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