Laser-based sensing in the long-wavelength mid-infrared: chemical kinetics and environmental monitoring applications

Ali Elkhazraji; Mohammad Khaled Shakfa; Nawaf Abualsaud; Mhanna Mhanna; Mohamed Sy; Marco Marangoni; Aamir Farooq

doi:10.1364/AO.481281

Laser-based sensing in the long-wavelength mid-infrared: chemical kinetics and environmental monitoring applications

Ali Elkhazraji, Mohammad Khaled Shakfa, Nawaf Abualsaud, Mhanna Mhanna, Mohamed Sy, Marco Marangoni, Aamir Farooq^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We present chemical kinetics and environmental monitoring applications in the long-wavelength mid-infrared (LW-MIR) region using a new diagnostic that exploits a widely tunable light source emitting in the LW-MIR. The custom-designed laser source is based on a difference-frequency generation (DFG) process in a nonlinear orientation-patterned GaAs crystal. The pump laser, an external-cavity quantum cascade laser, is tuned in a continuous-wave (cw) mode, while the signal laser, a CO₂ gas laser, is operated in a pulsed mode with a kilohertz repetition rate. The idler wavelength can be tuned between 11.58 (863.56 cm⁻¹) and 15.00 µm (666.67 cm⁻¹) in a quasi-cw manner. We discuss the unique prospective applications offered by probing the LW-MIR region for chemical kinetics and environment-monitoring applications. We showcase the potential of the DFG laser source by some representative applications.

Original language	English (US)
Pages (from-to)	A46-A58
Journal	Applied Optics
Volume	62
Issue number	6
DOIs	https://doi.org/10.1364/AO.481281
State	Published - Feb 20 2023

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Engineering (miscellaneous)
Electrical and Electronic Engineering

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10.1364/AO.481281

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title = "Laser-based sensing in the long-wavelength mid-infrared: chemical kinetics and environmental monitoring applications",

abstract = "We present chemical kinetics and environmental monitoring applications in the long-wavelength mid-infrared (LW-MIR) region using a new diagnostic that exploits a widely tunable light source emitting in the LW-MIR. The custom-designed laser source is based on a difference-frequency generation (DFG) process in a nonlinear orientation-patterned GaAs crystal. The pump laser, an external-cavity quantum cascade laser, is tuned in a continuous-wave (cw) mode, while the signal laser, a CO2 gas laser, is operated in a pulsed mode with a kilohertz repetition rate. The idler wavelength can be tuned between 11.58 (863.56 cm−1) and 15.00 µm (666.67 cm−1) in a quasi-cw manner. We discuss the unique prospective applications offered by probing the LW-MIR region for chemical kinetics and environment-monitoring applications. We showcase the potential of the DFG laser source by some representative applications.",

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AU - Elkhazraji, Ali

AU - Shakfa, Mohammad Khaled

AU - Abualsaud, Nawaf

AU - Mhanna, Mhanna

AU - Sy, Mohamed

AU - Marangoni, Marco

AU - Farooq, Aamir

PY - 2023/2/20

Y1 - 2023/2/20

N2 - We present chemical kinetics and environmental monitoring applications in the long-wavelength mid-infrared (LW-MIR) region using a new diagnostic that exploits a widely tunable light source emitting in the LW-MIR. The custom-designed laser source is based on a difference-frequency generation (DFG) process in a nonlinear orientation-patterned GaAs crystal. The pump laser, an external-cavity quantum cascade laser, is tuned in a continuous-wave (cw) mode, while the signal laser, a CO2 gas laser, is operated in a pulsed mode with a kilohertz repetition rate. The idler wavelength can be tuned between 11.58 (863.56 cm−1) and 15.00 µm (666.67 cm−1) in a quasi-cw manner. We discuss the unique prospective applications offered by probing the LW-MIR region for chemical kinetics and environment-monitoring applications. We showcase the potential of the DFG laser source by some representative applications.

AB - We present chemical kinetics and environmental monitoring applications in the long-wavelength mid-infrared (LW-MIR) region using a new diagnostic that exploits a widely tunable light source emitting in the LW-MIR. The custom-designed laser source is based on a difference-frequency generation (DFG) process in a nonlinear orientation-patterned GaAs crystal. The pump laser, an external-cavity quantum cascade laser, is tuned in a continuous-wave (cw) mode, while the signal laser, a CO2 gas laser, is operated in a pulsed mode with a kilohertz repetition rate. The idler wavelength can be tuned between 11.58 (863.56 cm−1) and 15.00 µm (666.67 cm−1) in a quasi-cw manner. We discuss the unique prospective applications offered by probing the LW-MIR region for chemical kinetics and environment-monitoring applications. We showcase the potential of the DFG laser source by some representative applications.

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JO - Applied Optics

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Laser-based sensing in the long-wavelength mid-infrared: chemical kinetics and environmental monitoring applications

Abstract

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