title: A novel frequency control scheme for comb-referenced sensitive difference-frequency-generation spectroscopy.
abstract: We present a novel scheme of frequency scan and wavelength modulation of a difference-frequency-generation source for comb-referenced sensitive spectroscopy. While the pump and signal frequencies are phase-locked to an optical frequency comb (OFC), the offset frequency between the signal wave and the nearest comb tooth is modulated to apply a wavelength-modulation technique, and the idler wave frequency is repeatedly swept for signal accumulation by changing the repetition frequency of the OFC. The spectrometer is applied to absolute frequency measurement of weak hyperfine-resolved rovibration transitions of the ν(1) band of CH(3)I, and the uncertainty in frequency determination is reduced by one order of magnitude in compared with that of the previous work published in Optics Express 20, 9178-9186 (2012).
authors.affiliation: Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan. k.iwakuni@z7.keio.jp
authors.forename: Kana
authors.initials: K
authors.lastname: Iwakuni
authors.forename: Sho
authors.initials: S
authors.lastname: Okubo
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sasada
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods*