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Title:Thz Fabry-perot Spectrometer
Author(s):Hindle, Francis
Contributor(s):Mouret, Gaël; Cuisset, Arnaud; Bocquet, Robin; Pienkina, A.; Simon, Fabien; Elmaleh, Coralie
Subject(s):Instrument/Technique Demonstration
Abstract:The development of Cavity-Enhanced Techniques and Cavity Ring Down Spectroscopy has allowed many sensitive infrared measurements to be undertaken. We have constructed a THz resonator with a high finesse to form the basis of a new instrument for sensitive cavity enhanced THz measurements. The resonator uses a low loss oversized corrugated waveguide and high reflectivity photonic mirrors. An effective path length of one kilometer is obtained for a device that is 50 cm in length. A significant sensitivity improvement has been evaluated at 620 GHz by the measurement of minority isotopologues of OCS\footnote{Francis Hindle, Robin Bocquet, Anastasiia Pienkina, Arnaud Cuisset, and Gaël Mouret, Terahertz gas phase spectroscopy using a high finesse Fabry-Pérot cavity Optica (2019) vol 6, 1449-1454 DOI: 10.1364/OPTICA.6.001449}. The sensitivity achieved has allowed several centrifugal distortion-induced rotational lines of CF$_4$ to be recorded and its tetrahedral splitting to be resolved \footnote{Cuisset A, Hindle F, Mouret G, Bocquet R, Bruckhuisen J, Decker J, Pienkina A, Bray C, Fertein E, Boudon V. Terahertz Rotational Spectroscopy of Greenhouse Gases Using Long Interaction Path-Lengths Applied Sciences (2021) vol 11(3) p 1229.}.
Issue Date:2021-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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