Optical feedback stabilized laser cavity ring down spectroscopy: From saturated spectroscopy to isotopic ratio
Kassi, Samir
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https://hdl.handle.net/2142/100452
Description
Title
Optical feedback stabilized laser cavity ring down spectroscopy: From saturated spectroscopy to isotopic ratio
Author(s)
Kassi, Samir
Contributor(s)
Campargue, Alain
Landais, Amaelle
Casado, Mathieu
Daëron, Mathieu
Stoltmann, Tim
Issue Date
2018-06-19
Keyword(s)
Mini-symposium: Frequency-Comb Spectroscopy
Abstract
Optical feedback frequency stabilized cavity ring-down spectroscopy is a very high resolution (sub kHz) and sensitive technique (2× 10−12 cm−1 limit of detection). Both aspects will be emphasized through the two followingh applications:
To illustrate the high resolution, Doppler-free saturated-absorption Lamb dips were measured at sub-Pa pressures on rovibrational lines of H2O near 7180 cm−1 , The saturation of the considered lines was so high that at the early stage of the ring down, the cavity loss rate remained unaffected by the absorption. By referencing the laser source to an optical frequency comb, transition frequencies were determined down to 100 Hz precision and kHz accuracy.
To highlight the high precision and stability of the instrument, we will present the first optical absorption measurements of O-17 anomalies in CO2 with a precision better than 10 ppm, matching the requirements for paleo-environmental applications.
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