A widely tunable difference-frequency-generation laser for high-resolution spectroscopy in the 667–865 cm–1 range

Mohammad Khaled Shakfa; Marco Lamperti; Riccardo Gotti; Davide Gatti; Ali Elkhazraji; Khaiyom Hakimov; Marco Marangoni; Aamir Farooq

doi:10.1117/12.2577534

5 March 2021 A widely tunable difference-frequency-generation laser for high-resolution spectroscopy in the 667–865 cm^–1 range

Mohammad Khaled Shakfa, Marco Lamperti, Riccardo Gotti, Davide Gatti, Ali Elkhazraji, Khaiyom Hakimov, Marco Marangoni, Aamir Farooq

Author Affiliations +

Proceedings Volume 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX; 116700A (2021) https://doi.org/10.1117/12.2577534
Event: SPIE LASE, 2021, Online Only

Abstract

Mid-infrared (MIR) laser sources are used in a number of applications such as remote sensing, air pollution monitoring, combustion diagnostics, and molecular spectroscopy. Here, we present our work on the development of a MIR laser source based on the difference frequency generation (DFG) process between an external-cavity quantum-cascade-laser tunable over 1750–1835 cm^–1 (pump source) and a CO₂ gas laser tunable over 921–1083 cm^–1 (signal source). The DFG process was realized in a nonlinear, orientation-patterned GaAs crystal, and resulted in an idler spectral range between 667–865 cm^–1 with a linewidth of ~2.3 MHz and an output power of up to ~31 μW. Exploiting the fine tunability of our DFG laser source, we performed high-resolution absorption measurements of ethylene (C₂H₄) and acetylene (C₂H₂).

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Mohammad Khaled Shakfa, Marco Lamperti, Riccardo Gotti, Davide Gatti, Ali Elkhazraji, Khaiyom Hakimov, Marco Marangoni, and Aamir Farooq "A widely tunable difference-frequency-generation laser for high-resolution spectroscopy in the 667–865 cm^–1 range", Proc. SPIE 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX, 116700A (5 March 2021); https://doi.org/10.1117/12.2577534

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