Doppler-Free Two-Photon Cavity Ring-Down Spectroscopy of a Molecular Vibrational Overtone Transition

We demonstrate Doppler-free two-photon cavity ring-down spectroscopy using a narrow linewidth quantum cascade laser locked to a high-finesse cavity. Two-photon absorption of (N2O)-N-14-O-16 at (similar to)(0)=2207.507 cm(-1) is reported. (C) 2021 The Author(s)

Automated summary

This study demonstrates Doppler-free two-photon cavity ring-down spectroscopy using a narrow linewidth quantum cascade laser locked to a high-finesse cavity, and reports the two-photon absorption of N2O-N-14-O-16 at around 2207.507 cm(-1).