All-optical athermalization of infrared imaging systems using thermally dependent binary phase masks

Shay Elmalem, Emanuel Marom

Research output: Contribution to journalArticlepeer-review

Abstract

Lenses used in many infrared (IR) imaging systems are temperature sensitive. One of the most popular IR optical materials for lens fabrication is germanium; nevertheless, it exhibits a strong temperature dependent refractive index, causing significant thermal focal shift which in turn results in image blur. An all-optical solution for IR lens athermalization with no moving parts based on a thermally dependent binary phase mask is hereby proposed and analyzed. It allows high quality imaging to be obtained for a wide range of temperature variations, with minimal performance degradation at nominal temperature conditions.

Original languageEnglish
Article number065604
JournalJournal of Optics (United Kingdom)
Volume18
Issue number6
DOIs
StatePublished - Jun 2016

Keywords

  • athermalization
  • depth of field
  • imaging
  • infrared
  • phase mask

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