Open AccessA novel frequency control scheme for comb-referenced sensitive difference-frequency-generation spectroscopy
Author(s) -
Kana Iwakuni,
Sho Okubo,
Hiroyuki Sasada
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.014832
Subject(s) - optics , frequency comb , frequency modulation , frequency offset , physics , wavelength , spectroscopy , modulation (music) , signal (programming language) , phase modulation , offset (computer science) , comb generator , frequency deviation , optical frequency comb , automatic frequency control , phase noise , radio frequency , laser , telecommunications , computer science , acoustics , channel (broadcasting) , quantum mechanics , orthogonal frequency division multiplexing , programming language
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).