Sub-doppler optical-optical double-resonance spectroscopy of methane using a frequency comb probe
Résumé
We use a 3.3 µm high-power continuous wave pump and a 1.67 µm comb probe to detect transitions in the 3ν3 ← ν3 range of methane with sub-Doppler resolution over 6 THz of bandwidth. We achieve high absorption sensitivity for the comb probe using an enhancement cavity and a Fourier transform spectrometer with auto-balanced detection. © OSA 2021, © 2021 The Author(s)
Mots clés
Fourier transform infrared spectroscopy
Methane
Spectrometers
Terahertz spectroscopy
Terahertz waves
Absorption sensitivity
Auto-balanced detection
Continuous wave pump
Doppler
Doppler-resolution
Enhancement cavities
Fourier transform spectrometers
Frequency combs
High power
Optical-optical double resonance spectroscopy
Probes
Molecular physics