Intracavity absorption spectroscopy of HCl isotopes, H 2 O, CH 4 , C 2 H 4 , and C 2 H 6 in the 3.1–3.4 µm spectral range using a Cr:CdSe laser

• Published in: Optics express Vol. 30; no. 22; p. 40347
• Main Authors: Fjodorow, Peter, Frolov, Mikhail P., Korostelin, Yuri V., Kozlovsky, Vladimir I., Schulz, Christof, Leonov, Stanislav O., Skasyrsky, Yan K., Yuryshev, Nikolai N.
• Format: Journal Article
• Language: English
• Published: 24.10.2022
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.471851

We demonstrate the first application of a Cr:CdSe laser for highly-sensitive multicomponent intracavity absorption spectroscopy around λ = 3.1–3.4 µm. A detection scheme based on an integrated recording of multiple (∼70) individual Cr:CdSe laser pulses after a single pump-pulse excitation is reported. The sensitivity of our system corresponds to an effective absorption path length of L eff ≈ 850 m. Exemplary measurements of atmospheric H 2 O and CH 4 , and additionally introduced gas-phase HCl, C 2 H 4 , or C 2 H 6 are presented. The achieved noise-equivalent detection limits are in the ppb range. Possibilities for further sensitivity enhancement by up to a factor of 10 4 are discussed.