Gas Analysis with High-Resolution Fabry-Perot Spectrometry in the 550-650 GHz Range
Résumé
The development of a high finesse THz cavity has enabled the construction of a Fabry-Perot spectrometer. This approach can be applied to the THz frequencies (submillimeter wavelengths) allowing the rotational transitions to be probed. The intra-cavity power levels have permitted the sub-Doppler Lamb-dip profiles of ethanol to be observed. The quantification of a trace of H2S is demonstrated with a detection limit around 60 ppb.