Abstract
We implement a cavity to enhance the absorption of a frequency comb probe in a double-resonance measurement of sub-Doppler 3ν3 ← ν3 methane transitions. This yields two orders of magnitude better sensitivity in 15 times shorter acquisition time compared to previous work using a single-pass cell. © 2021 The Authors OCIS codes: 300.1030, 300.6190, 300.6320, 300.6390.
© 2021 The Author(s)
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