Abstract

We present a novel, to the best of our knowledge, system for high-resolution, time-resolved spectroscopy in the mid-wave infrared based on a modelocked vertical external cavity surface emitting laser (VECSEL) frequency comb coupled to a virtually imaged phased array (VIPA) spectrometer. The GHz level repetition rate of VECSEL-based systems coupled to VIPA spectrometers enables comb tooth resolved spectra without the use of additional filter cavities often required to increase comb tooth spacing. We demonstrate absorption spectroscopy on a methane (${\rm CH}{_4}$) gas mixture at $2900\;{{\rm cm}^{- 1}}$ (3.4 µm) with over $35\;{{\rm cm}^{- 1}}$ spectral bandwidth in a single image. Rapid time-resolved measurements were made using a 300 µs exposure time with an acquisition rate limited to 125 Hz by the available camera. High-resolution absolute frequency measurements were performed by scanning the repetition rate of the VECSEL frequency comb.

© 2020 Optical Society of America

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Supplementary Material (1)

NameDescription
» Visualization 1       Video showing time resolved absorbance from methane/argon gas mixture filling a gas cell as detected with mid-IR DFG comb and VIPA spectrometer. The data capture rate was 125 Hz and the playback frame rate of the video is 30 Hz. The gas flow was init

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