Hybrid refractive/diffractive optical system design for light and compact uncooled longwave infrared imager

Hu Wang, Yu Bai, Jianjun Luo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

Compares with traditional optics,the difractive optical element(DOE) has unique property of minus dispersion.The special state can be used in the optical system to improve performance,lighten weight and reduce volume effectively.In the paper,an infrared optical system with DOE for LWIR thermal imager is proposed.The primary optical parameters of thermal imager are wavelength range 8.0- 12.0μm,effective focal length (EFL) 150 mm,f/numbe 1.0 and field of view 8.58 degrees.The system uses uncooled infrared detector with 320×240 pixels and 45μm pixel size. The f/number matches the sensitivity range of detector array. The infrared optical system is designed by CODE-V optical design software.It is consisted of two lens,the materials of the two lenses are Germanium.The DOE is fabricated on the convex of the first lens and it can be fabricated by diamond turning technology.The imaging quafity of the optical system approached to diffraction limit.The value of modulation transfer function (MTF) at Nyquist frequency(11lp/mm) is great than 0.78.

Original languageEnglish
Title of host publication6th International Symposium on Advanced Optical Manufacturing and Testing Technologies
Subtitle of host publicationAdvanced Optical Manufacturing Technologies
DOIs
StatePublished - 2012
Event6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies - Xiamen, China
Duration: 26 Apr 201229 Apr 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8416
ISSN (Print)0277-786X

Conference

Conference6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Country/TerritoryChina
CityXiamen
Period26/04/1229/04/12

Keywords

  • Hybrid refractive/diffractive
  • Infrared optics
  • Optical design

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