Upconversion based spectral imaging in 6 to 8 μm spectral regime

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Spectral imaging in the 6 to 8μm range has great potential for medical diagnostics. Here a novel technique based on frequency upconversion of the infrared images to the near visible for subsequent acquisition using a Si-CCD camera is investigated. The upconversion unit consists of an AgGaS2 crystal and a 1064nm diode pumped solid state laser. A globar is used as mid-infrared illumination source. Acquired images contain both spectral and spatial information. Angle tuning of the nonlinear crystal is exploited to scan the phase match condition, which allows to cover the full spectral range of interest for the full field of view. Simulated images are created and compared with the measured images.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages7
PublisherSPIE - International Society for Optical Engineering
Publication date2017
Article number100880I
Publication statusPublished - 2017
EventNonlinear Frequency Generation and Conversion: Materials and Devices XVI: SPIE Conference 10088 - The Moscone Center, San Francisco, United States
Duration: 28 Jan 20172 Feb 2017
Conference number: 10088


ConferenceNonlinear Frequency Generation and Conversion: Materials and Devices XVI
LocationThe Moscone Center
CountryUnited States
CitySan Francisco
SeriesProceedings of S P I E - International Society for Optical Engineering

Bibliographical note

Copyright 2017 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Sum frequency generation (SFG)
  • Birefringence
  • Non-collinear phase matching
  • Spectral imaging

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