Agile optoelectronic fiber sources for hyperspectral chemical sensing from SWIR to LWIR

Inuk Kang, Andrew Grant, Mihaela Dinu, James Jaques, Luke Pfister, Rohit Bhargava, P. Scott Carney

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The use of optical frequency combs (OFCs) for multi-heterodyne spectroscopy has enabled unprecedented measurement capabilities for spectroscopic sensing, including rapid acquisition speed, high resolution and high sensitivity1,2. Development of field deployable OFC sources that are widely tunable in the important chemical fingerprint region in the long-wavelength infrared (LWIR) is a major research challenge. In this paper, we report our recent efforts towards developing LWIR comb source for SILMARILS (Standoff ILluminator for Measuring Absorbance and Reflectance Infrared Light Signatures) program by IARPA. LGS has developed fiber optic sources producing spectral combs in the SWIR (1.52 to 1.56 μm and 1.7 to 2.0 μm) and in the LWIR (7.7 to 12.1 μm) regions. The spectral combs in the LWIR are generated by difference-frequency mixing one OFC centered around 1.54 μm with another OFC, whose center wavelength is tunable between 1.7 and 2.0 μm, in a nonlinear optical crystal. Average power of the generated LWIR is 1.2-12 mW and its instantaneous spectral breadth of the combs is > 80 cm-1, sufficiently broad to cover multiple molecular absorption peaks. We demonstrate standoff sensing of chemical targets having concentration as low as 12 μg/cm2 by measuring LWIR transflectance spectra using the comb source.

Original languageEnglish (US)
Title of host publicationAlgorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXIV
EditorsDavid W. Messinger, Miguel Velez-Reyes
PublisherSPIE
ISBN (Electronic)9781510617995
DOIs
StatePublished - Jan 1 2018
EventAlgorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXIV 2018 - Orlando, United States
Duration: Apr 17 2018Apr 19 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10644
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherAlgorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXIV 2018
CountryUnited States
CityOrlando
Period4/17/184/19/18

Keywords

  • Chemical sensing
  • Hyperspectral spectroscopy
  • Long-wave infrared
  • Optical frequency comb
  • Standoff detection

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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  • Cite this

    Kang, I., Grant, A., Dinu, M., Jaques, J., Pfister, L., Bhargava, R., & Carney, P. S. (2018). Agile optoelectronic fiber sources for hyperspectral chemical sensing from SWIR to LWIR. In D. W. Messinger, & M. Velez-Reyes (Eds.), Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXIV [106441E] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10644). SPIE. https://doi.org/10.1117/12.2305120