Open AccessCavity-enhanced optical frequency comb spectroscopy of high-temperature H_2O in a flame
Author(s) -
Chadi Abd Alrahman,
Amir Khodabakhsh,
Florian M. Schmidt,
Zhechao Qu,
Aleksandra Foltynowicz
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.013889
Subject(s) - materials science , optics , finesse , femtosecond , tunable diode laser absorption spectroscopy , spectroscopy , fourier transform spectroscopy , absorption spectroscopy , laser , spectrometer , fourier transform infrared spectroscopy , cavity ring down spectroscopy , optical cavity , optical fiber , infrared spectroscopy , tunable laser , fabry–pérot interferometer , chemistry , physics , organic chemistry , quantum mechanics
We demonstrate near-infrared cavity-enhanced optical frequency comb spectroscopy of water in a premixed methane/air flat flame. The detection system is based on an Er:fiber femtosecond laser, a high finesse optical cavity containing the flame, and a fast-scanning Fourier transform spectrometer (FTS). High absorption sensitivity is obtained by the combination of a high-bandwidth two-point comb-cavity lock and auto-balanced detection in the FTS. The system allows recording high-temperature water absorption spectra with a resolution of 1 GHz and a bandwidth of 50 nm in an acquisition time of 0.4 s, with absorption sensitivity of 4.2 × 10(-9) cm(-1) Hz(-1/2) per spectral element.