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A rapid, spatially dispersive frequency comb spectrograph aimed at gas phase chemical reaction kinetics

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A rapid, spatially dispersive frequency comb spectrograph aimed at gas phase chemical reaction kinetics

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  • Author: F. C. Roberts, H. J. Lewandowski, B. F. Hobson, and J. H. Lehman
This New Views article will highlight some recent advances in high sensitivity gas detection using direct infrared absorption frequency comb laser spectroscopy, with a focus on frequency comb use in chemical reaction kinetics and our own contribution to this field. Our recently implemented detection technique uses a combination of a 12.9GHz free spectral range virtually imaged phased array and diffraction grating to spatially disperse the mid-infrared frequency comb onto a camera. Individual frequencies or ‘comb teeth’ of a 250MHz repetition-rate frequency comb are able to be resolved. High molecular sensitivity is achieved by increasing the interaction path length using a Herriott multipass cell.

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