Abstract
Random vibrations were employed to pick up each monochromatic component in a continuous-wave cavity ringdown spectroscopy (CRDS) system using a bichromatic laser source. Light frequencies were selected within flat portions of an absorption profile to suppress the jitter in laser frequency during measurements. An interference effect caused by cavity length variations was suppressed by optimizing the initial fit point for each ringdown transient. The difference in exponential decay rates of two frequencies determined the gas mole fraction, and no calibration of empty cavity losses was necessary. Experiments on varying humidity were conducted, and the results agreed with the readings of a commercial hygrometer.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Mikołaj Zaborowski, Michał Słowiński, Kamil Stankiewicz, Franck Thibault, Agata Cygan, Hubert Jóźwiak, Grzegorz Kowzan, Piotr Masłowski, Akiko Nishiyama, Nikodem Stolarczyk, Szymon Wójtewicz, Roman Ciuryło, Daniel Lisak, and Piotr Wcisło
Opt. Lett. 45(7) 1603-1606 (2020)
Hui Zhang, Dongqing Zhang, Mengpeng Hu, and Qiang Wang
Opt. Lett. 48(22) 5996-5999 (2023)
Anulekha De, Gourab Dutta Banik, Abhijit Maity, Mithun Pal, and Manik Pradhan
Opt. Lett. 41(9) 1949-1952 (2016)