Open AccessPossible two-photon absorption in the near-infrared region observed by cavity ring-down spectroscopy
Author(s) -
Lei Yang,
Hong Lin,
Mark Plimmer,
Xiaoqiang Feng,
Hongwei Chu,
Yongjian Ma,
Jingting Luo,
HongBo Sun,
Jintao Zhang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.409421
Subject(s) - spectroscopy , cavity ring down spectroscopy , absorption (acoustics) , absorption spectroscopy , materials science , infrared spectroscopy , two photon absorption , photon , optics , infrared , resonance (particle physics) , attenuation coefficient , time resolved spectroscopy , atomic physics , physics , laser , quantum mechanics
Two-photon absorption spectra are difficult to observe using direct absorption spectroscopy especially in the near-infrared region. Cavity ring-down spectroscopy is a promising absorption spectroscopy technique which has been widely applied to linear and saturated single-photon absorption spectra. In the present study, we report the observation of a possible two-photon absorption in the near-infrared using cavity ring-down spectroscopy, namely a two-photon resonance of methane. Using an optical frequency comb, the single-photon wavenumber of the double-quantum transition has been determined to be 182 207 682.645 MHz with a standard deviation of 75 kHz.