title: Cavity-enhanced optical frequency comb spectroscopy of high-temperature H2O in a flame.
abstract: 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.
authors.forename: Chadi
authors.initials: C
authors.lastname: Abd Alrahman
authors.forename: Amir
authors.initials: A
authors.lastname: Khodabakhsh
authors.forename: Florian M
authors.initials: FM
authors.lastname: Schmidt
authors.forename: Zhechao
authors.initials: Z
authors.lastname: Qu
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Foltynowicz