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Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe

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Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe

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  • Author: A. Foltynowicz, L. Rutkowski, I. Silander, A. C. Johansson, V. Silva de Oliveira, O. Axner, G. Sobon, T. Martynkien, P. Mergo, and K. K. Lehmann
We report the first measurement of sub-Doppler molecular response using a frequency comb by employing the comb as a probe in optical-optical double-resonance spectroscopy. We use a 3.3 μm continuous wave pump and a 1.67 μm comb probe to detect sub-Doppler transitions to the 2ν3 and 3ν3 bands of methane with ∼1.7 MHz center frequency accuracy. These measurements provide the first verification of the accuracy of theoretical predictions from highly vibrationally excited states, needed to model the high-temperature spectra of exoplanets.

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