Open AccessFourier transform spectrometer based on high-repetition-rate mid-infrared supercontinuum sources for trace gas detection
Author(s) -
Muhammad Ali Abbas,
Khalil Eslami Jahromi,
Mohammadreza Nematollahi,
R. Krebbers,
N. Liu,
Getinet Woyessa,
Ole Bang,
Laurent Huot,
F.J.M. Harren,
Amir Khodabakhsh
Publication year - 2021
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.425995
Subject(s) - supercontinuum , optics , spectrometer , trace gas , baseband , materials science , infrared , fourier transform spectroscopy , spectral resolution , fourier transform infrared spectroscopy , physics , wavelength , optoelectronics , spectral line , cmos , astronomy , meteorology , photonic crystal fiber
We present a fast-scanning Fourier transform spectrometer (FTS) in combination with high-repetition-rate mid-infrared supercontinuum sources, covering a wavelength range of 2-10.5 µm. We demonstrate the performance of the spectrometer for trace gas detection and compare various detection methods: baseband detection with a single photodetector, baseband balanced detection, and synchronous demodulation at the repetition rate of the supercontinuum source. The FTS uses off-the-shelf optical components and provides a minimum spectral resolution of 750 MHz. It achieves a noise equivalent absorption sensitivity of ∼10 -6 cm -1 Hz -1/2 per spectral element, by using a 31.2 m multipass absorption cell.