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Title: Long wavelength mid-infrared multi-gases spectroscopy using tunable single-mode slot waveguide quantum cascade laser
Authors: Jin, Yuhao
Sun, Fangyuan
Li, Jinghao
Tan, Chuan Seng
Tan, Kian Hua
Wicaksono, Satrio
Sirtori, Carlo
Yoon, Soon Fatt
Wang, Qi Jie
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2023
Source: Jin, Y., Sun, F., Li, J., Tan, C. S., Tan, K. H., Wicaksono, S., Sirtori, C., Yoon, S. F. & Wang, Q. J. (2023). Long wavelength mid-infrared multi-gases spectroscopy using tunable single-mode slot waveguide quantum cascade laser. Optics Express, 31(17), 27543-27552.
Project: NRF-CRP19-2017-01 
NRF-CRP22-2019- 0007 
Journal: Optics Express 
Abstract: Single-mode tunable quantum cascade lasers (QCLs) are promising for high-resolution and highly sensitive trace gases sensing across the mid-infrared (MIR) region. We report on the development of a tunable single-mode slot waveguide QCL array in the long wavelength part of the MIR regime (>12 µm). This laser array exhibits a tuning range of around 12 cm−1, from 735.3 to 747.3 cm−1. Using this developed single-mode tunable QCL, we demonstrate individual gas sensing, yielding the detection limit of 940 ppb and 470 ppb for acetylene and o-xylene, respectively. To verify the potential of the developed QCL array in multi-species gas detection, laser absorption measurements of two mixed gases of acetylene and o-xylene were conducted, showing the absorption features of the corresponding gases agree well with the theoretical predictions.
ISSN: 1094-4087
DOI: 10.1364/OE.495160
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Centre for OptoElectronics and Biophotonics (OPTIMUS) 
Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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