Dual-comb mid-infrared spectroscopy with free-running oscillators and absolute optical calibration from a radio-frequency reference

O. Kara, Z. Zhang, T. Gardiner, Derryck Telford Reid

Research output: Contribution to journalArticle

14 Citations (Scopus)
15 Downloads (Pure)

Abstract

By using free-running independent femtosecond OPOs with a repetition-rate difference of 500 Hz we demonstrate methane absorption spectroscopy with spectral coverage simultaneously spanning the methane P, Q and R branches and with a resolution of 0.5 cm-1. Absolute optical frequency calibration with an accuracy of 0.25 cm-1 (0.27 nm) is achieved from simultaneous repetition-rate and carrier-envelope-offset frequency measurements, without the need for any optical reference. The calibration technique allows registration and averaging of consecutively acquired dual-comb spectra, leading to a high quality and low-noise absorbance measurement in good agreement with the HITRAN database.
Original languageEnglish
Pages (from-to)16072-16082
Number of pages11
JournalOptics Express
Volume25
Issue number14
DOIs
Publication statusPublished - 10 Jul 2017

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