title: Cavity ring-down spectroscopy of Doppler-broadened absorption line with sub-MHz absolute frequency accuracy.
abstract: A continuous-wave cavity ring-down spectrometer has been built for precise determination of absolute frequencies of Doppler-broadened absorption lines. Using a thermo-stabilized Fabry-Pérot interferometer and Rb frequency references at the 780 nm and 795 nm, 0.1 - 0.6 MHz absolute frequency accuracy has been achieved in the 775-800 nm region. A water absorption line at 12579 cm(-1) is studied to test the performance of the spectrometer. The line position at zero-pressure limit is determined with an uncertainty of 0.3 MHz (relative accuracy of 0.8 × 10(-9)).
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026 China.
authors.forename: C-F
authors.initials: CF
authors.lastname: Cheng
authors.forename: Y R
authors.initials: YR
authors.lastname: Sun
authors.forename: H
authors.initials: H
authors.lastname: Pan
authors.forename: Y
authors.initials: Y
authors.lastname: Lu
authors.forename: X-F
authors.initials: XF
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: A-W
authors.initials: AW
authors.lastname: Liu
authors.forename: S-M
authors.initials: SM
authors.lastname: Hu
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation*