Open AccessHigh-speed cavity ringdown spectroscopy with increased spectral resolution by simultaneous laser and cavity tuning
Author(s) -
Isabelle Debecker,
Ajmal Khan Mohamed,
D. Romanini
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.002906
Subject(s) - optics , laser , spectroscopy , materials science , continuous wave , optical cavity , spectral resolution , cavity ring down spectroscopy , resolution (logic) , physics , spectral line , computer science , quantum mechanics , astronomy , artificial intelligence
Cavity ringdown spectroscopy is an efficient gas-sensing method, but improvement in measurement speed is required before this method can be applied to the analysis of fast phenomena. We present a new continuous-wave cavity ringdown design, involving fast tuning of the laser frequency and a rapidly swept optical cavity, to allow high-speed sensing with spectral resolution refinement. This approach, which provides a simple and versatile instrument, is investigated numerically and experimentally. By performing detection of a forbidden transition of molecular oxygen near 766 nm during a 2-ms single sweep of the laser frequency, we show that our system fulfils the requirements for probing rapid chemical processes.