Open AccessDual-comb spectroscopy of methane based on a free-running Erbium-doped fiber laser
Author(s) -
Jie Chen,
Xin Zhao,
Zijun Yao,
Ting Li,
Qian Li,
Shuguo Xie,
Jiansheng Liu,
Zheng Zhang
Publication year - 2019
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.27.011406
Subject(s) - hitran , optics , spectroscopy , materials science , laser , lasing threshold , fiber laser , supercontinuum , optoelectronics , optical cavity , wavelength , absorption spectroscopy , photonic crystal fiber , physics , quantum mechanics
Dual-comb spectroscopy has been developed into a high-precision technique that is capable of sensing many important species of samples, such as methane. Recent studies on single-cavity, dual-comb light sources further reduce the system complexity of such schemes. In contrast to the previous demonstrations around the lasing spectrum, this work significantly expands the spectral coverage of a dual-comb spectroscopy setup using one free-running laser to a region far beyond the laser's emission wavelengths. Nonlinear wavelength conversion based on soliton self-frequency shift is adopted to convert and tune the wavelengths of both dual-comb pulses to ~1650nm. It is shown that this process has introduced little additional intensity noise. The 2ν 3 absorption band of methane from 1647 nm to 1663nm is measured with very good agreement with HITRAN, and the standard deviation of the residual is < ~0.006 after averaging ~1.96 seconds of data. Our results further elucidate the potential of dual-comb spectroscopy using one laser, and could pave the way for the development of low-cost, power-efficient, and compact dual-comb instrument targeting more spectral regions.