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Optica Publishing Group
  • Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment
  • OSA Technical Digest Series (CD) (Optica Publishing Group, 2007),
  • paper FMB1
  • https://doi.org/10.1364/FTS.2007.FMB1

Coherent Fourier-Transform Spectroscopy Based on Infrared Frequency Combs

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Abstract

We demonstrate real-time recording of chemical vapor fluctuations from 22 m away with a fast Fourier-transform infrared (FTIR) spectrometer that uses a laser-like infrared probing beam generated from two 10-fs Ti:sapphire lasers. The spectrometer's broad 9–12 µm spectrum in the “molecular fingerprint” region is dispersed by fast heterodyne self-scanning, enabling 60 μs snapshot spectra at 2 cm−1 spectral resolution. We further achieve continuous acquisition at a rate of 1000 IR spectra per second by actively manipulating the repetition rate of one laser. Applications include video-rate chemical imaging and transient spectroscopy of e.g. gas plumes, flames and plasmas, and generally non-repetitive phenomena such as those found in protein folding dynamics and pulsed magnetic fields research.

© 2007 Optical Society of America

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