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

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Abstract

By using free-running femtosecond OPOs with a repetition-rate difference of ~500 Hz we demonstrate methane absorption spectroscopy at a resolution < 0.08 cm−1, fully calibrated in the optical domain from repetition-rate and carrier-envelope-offset frequency measurements.

© 2017 Optical Society of America

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