Direct-comb molecular spectroscopy by heterodyne detection with continuous-wave laser for high sensitivity

Taro Hasegawa, Hiroyuki Sasada

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have demonstrated direct-comb molecular spectroscopy in which an individual-comb mode is resolved by heterodyne detection with a continuous-wave (cw) laser. This simple, fast, and sensitive technique was demonstrated for atomic spectroscopy in [Appl. Phys. Lett. 101, 051105 (2012)], but is more suitable for molecular spectroscopy. Four rotation-vibration transitions of methane have simultaneously been recorded in a Doppler-limited resolution using a spectrally broadened comb based on an Er-doped fiber laser and a cw 1651-nm distributed-feedback laser diode. Even though the power level of the comb modes and the sample absorption are weaker than those of the previous studies, in this work the cw laser frequency is stabilized to one of the comb modes, and the data are thereby averaged for extended periods of time, resulting an improvement in sensitivity.

Original languageEnglish
Pages (from-to)A680-A688
JournalOptics Express
Volume25
Issue number16
DOIs
Publication statusPublished - 2017 Aug 7

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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