title: Direct-comb molecular spectroscopy with accurate, resolved comb teeth over 43 THz.
abstract: We demonstrate a dual-comb spectrometer using stabilized frequency combs spanning 177 to 220 THz (1360 to 1690 nm) in the near infrared. Comb-tooth-resolved measurements of amplitude and phase generate over 4×10(5) individually resolved spectral elements at 100 MHz point spacing and kilohertz-level resolution and accuracy. The signal-to-noise ratio is 100 to 3000 per comb tooth. Doppler-broadened phase and amplitude spectra of CO(2), CH(4), C(2)H(2), and H(2)O in a 30 m multipass cell agree with established spectral parameters, achieving high-resolution measurements with optical bandwidth generally associated with blackbody sources.
authors.affiliation: National Institute of Standards and Technology, Boulder, Colorado 80305, USA. Alex.Zolot@nist.gov
authors.forename: A M
authors.initials: AM
authors.lastname: Zolot
authors.forename: F R
authors.initials: FR
authors.lastname: Giorgetta
authors.forename: E
authors.initials: E
authors.lastname: Baumann
authors.forename: J W
authors.initials: JW
authors.lastname: Nicholson
authors.forename: W C
authors.initials: WC
authors.lastname: Swann
authors.forename: I
authors.initials: I
authors.lastname: Coddington
authors.forename: N R
authors.initials: NR
authors.lastname: Newbury