Mid-infrared upconversion based hyperspectral imaging

Saher Junaid*, Jan Tomko, Mykhaylo P. Semtsiv, Jan Kischkat, W. Ted Masselink, Christian Pedersen, Peter Tidemand-Lichtenberg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Mid-infrared hyperspectral imaging has in the past decade emerged as a promising tool for medical diagnostics. In this work, nonlinear frequency upconversion based hyperspectral imaging in the 6 to 8 mu m spectral range is presented for the first time, using both broadband globar and narrowband quantum cascade laser illumination. AgGaS2 is used as the nonlinear medium for sum frequency generation using a 1064 nm mixing laser. Angular scanning of the nonlinear crystal provides broad spectral coverage at every spatial position in the image. This study demonstrates the retrieval of series of monochromatic images acquired by a silicon based CCD camera, using both broadband and narrowband illumination and a comparison is made between the two illumination sources for hyperspectral imaging. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Original languageEnglish
JournalOptics Express
Issue number3
Pages (from-to)2203-2211
Publication statusPublished - 2018


  • Medicine
  • Semiconductor Devices and Integrated Circuits
  • Lasers, General
  • Imaging Techniques
  • CCD cameras
  • Diagnosis
  • Gallium compounds
  • Infrared devices
  • Medical imaging
  • Quantum cascade lasers
  • Silver compounds
  • Spectroscopy
  • Sulfur compounds
  • Angular scanning
  • Illumination sources
  • Medical diagnostics
  • Monochromatic images
  • Nonlinear crystals
  • Nonlinear frequency
  • Spatial positions
  • Sum frequency generation
  • Hyperspectral imaging


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