title: Cavity-ringdown molecular spectroscopy based on an optical frequency comb at 1.45-1.65 microm.
abstract: Optical frequency comb-based cavity-ringdown spectroscopy has recently enabled high-sensitivity absorption detection of molecules over a broad spectral range. We demonstrate an improved system based on a mode-locked erbium-doped fiber laser source centered at 1.5 microm, resulting in a spectrometer that is inexpensive, simple, and robust. It provides a very large spectral bandwidth (1.45-1.65 microm) for investigation of a wide variety of molecular absorptions. Strong molecular absorptions at 1.5 mum allow for detection at sensitivities approaching the 1 part in 10(9) volume level. We provide a detailed description of our spectrometer and present measurements of the rovibrational spectra for CO, NH3, and C2H2 with an absorption sensitivity of 2 x 10(-8) cm(-1)Hz(-1/2) per detection channel.
authors.affiliation: JILA, National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Thorpe
authors.forename: Darren D
authors.initials: DD
authors.lastname: Hudson
authors.forename: Kevin D
authors.initials: KD
authors.lastname: Moll
authors.forename: Jacob
authors.initials: J
authors.lastname: Lasri
authors.forename: Jun
authors.initials: J
authors.lastname: Ye