MID-INFRARED DOPPLER-FREE SATURATION ABSORPTION SPECTROSCOPY OF THE Q BRANCH OF CH4 ν3=1 BAND USING A RAPID-SCANNING CONTINUOUS-WAVE OPTICAL PARAMETRIC OSCILLATOR

Riyadh, S M Shah

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https://hdl.handle.net/2142/122638 Copy

Description

Title

MID-INFRARED DOPPLER-FREE SATURATION ABSORPTION SPECTROSCOPY OF THE Q BRANCH OF CH4 ν3=1 BAND USING A RAPID-SCANNING CONTINUOUS-WAVE OPTICAL PARAMETRIC OSCILLATOR

Author(s)

Riyadh, S M Shah

Contributor(s)

• Liu, Jinjun
• Hu, Shui-Ming
• Cheng, Cunfeng
• Foote, David B.
• Bersson, Jonathan Swift
• Jones, Ian
• Telfah, Hamzeh

Issue Date

2023-06-22

Keyword(s)

Mini-symposium: Infrared Spectroscopy in the JWST Era

Abstract

We have developed a mid-infrared Doppler-free saturation absorption spectroscopy apparatus using a continuous-wave optical parametric oscillator (CW-OPO). Here we report a comprehensive spectral scan of the Q branch transitions of the ν₃=1 band of methane (CH₄) with an average linewidth (FWHM) of 4.5 MHz. The absolute frequency calibration was achieved using previously reported transition frequencies determined using optical frequency combs, while an etalon was used for relative frequency calibration. We report 12 transitions with improved accuracies of ~3 MHz. These measurements are then used to lock to a single transition, which then can be used to access the higher polyads with a second photon via a transition that is measured through CW-CRDS.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122638

DOI

https://doi.org/10.15278/isms.2023.7154

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