Kara, O; Zhang, Z; Gardiner, T; Reid, D T (2017) Dual-comb mid-infrared spectroscopy with free-running oscillators and absolute optical calibration from a radio-frequency reference. Optics Express, 25 (14). pp. 16072-16082.

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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 < 0.08 cm-1. Absolute wavelength calibration is achieved from simultaneous repetition-rate and carrierenvelope-offset frequency measurements. 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.

Item Type:	Article
Subjects:	Environmental Measurement > Atmospheric Science, Emission and Security
Divisions:	Chemical, Medical & Environmental Science
Identification number/DOI:	10.1364/OE.25.016072
Last Modified:	06 Feb 2018 12:37
URI:	https://eprintspublications.npl.co.uk/id/eprint/7681