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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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).
Original languageEnglish (US)
Title of host publicationNonlinear Frequency Generation and Conversion: Materials and Devices XX
PublisherSPIE
ISBN (Print)9781510641754
DOIs
StatePublished - Mar 5 2021

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