Physical Review Letters
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Leveraging Resonant Frequencies of an Optical Cavity for Spectroscopic Measurement of Gas Temperature and Concentration
Author(s): Daniel Lisak, Vittorio D’Agostino, Szymon Wójtewicz, Agata Cygan, Marcin Gibas, Piotr Wcisło, Roman Ciuryło, and Katarzyna Bielska
We introduce a spectroscopic approach to primary gas thermometry, harnessing precise optical cavity resonance frequencies and ab initio molecular line intensity calculations. By utilizing CO (3-0) vibrational band lines and cavity mode dispersion spectroscopy, we achieve an uncertainty of 82 ppm (24… [Phys. Rev. Lett. 135, 103201] Published Wed Sep 03, 2025
