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Article Dans Une Revue Photonics and Nanostructures - Fundamentals and Applications Année : 2024

Cavity assisted high-resolution THz spectrometer

Résumé

The analysis of gases by THz radiation offers a high degree of discrimination due to the narrow linewidths that are observed at low pressure. The sensitivity of existing high-resolution instruments is limited by the availability and performance of critical system components. This study uses two key components with physical structures at the wavelength scale to realise a high finesse THz cavity. The cavity is characterised and incorporated into a spectrometer. Sensitivity limits of the instrument are experimentally demonstrated for trace and pure gases. Both CEAS (Cavity Enhanced Absorption Spectroscopy) and CRDS (Cavity Ring-Down Spectroscopy) configurations are shown to give sub-ppm detection levels. The cavity has also been used to measure the atmospheric losses.
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hal-04414010 , version 1 (24-01-2024)

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Fabien Simon, Coralie Elmaleh, Jean Decker, Marc Fourmentin, A. Cuisset, et al.. Cavity assisted high-resolution THz spectrometer. Photonics and Nanostructures - Fundamentals and Applications, 2024, 58, pp.101227. ⟨10.1016/j.photonics.2024.101227⟩. ⟨hal-04414010⟩
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