Infrared (IR) spectroscopy has the unique capability of combining qualitative and quantitative chemical information in a nondestructive way. Harnessing recent advances in the development of IR sources, especially polarized sources such as quantum cascade lasers (QCLs), novel techniques as well as challenges have been introduced owing to the QCLs' distinct characteristics including polarization, emission, and pulsing behavior. This chapter starts with a brief theoretical background followed by traditional conventions to quantify polarization. Next, instrumentation considerations and emerging designs of polarized IR spectrometer and imaging modalities are discussed, followed by illustrations of system characterization. Finally, we review some applications spanning tissue imaging to ellipsometry that are enabled by the high-throughput polarized light source.

Original languageEnglish (US)
Title of host publicationMolecular and Laser Spectroscopy
Subtitle of host publicationAdvances and Applications: Volume 3
Number of pages23
ISBN (Electronic)9780323912495
ISBN (Print)9780323914703
StatePublished - Jan 1 2022


  • IR
  • Imaging
  • Infrared
  • Polarized light
  • Quantum cascade lasers
  • Spectroscopy

ASJC Scopus subject areas

  • General Chemistry


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