A novel frequency control scheme for combreferenced sensitive difference-frequencygeneration spectroscopy

Kana Iwakuni, Sho Okubo, Hiroyuki Sasada

Research output: Contribution to journalArticle

8 Citations (Scopus)


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 ν1 band of CH3I, 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).

Original languageEnglish
Pages (from-to)14832-14840
Number of pages9
JournalOptics Express
Issue number12
Publication statusPublished - 2013 Jun


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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