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8 March 2024 Broadband mid-infrared Fourier transform photothermal spectroscopy using a quantum cascade laser frequency comb
Baichuan Huang, Tommi Mikkonen, Grzegorz Gomolka, Gerard Wysocki
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Proceedings Volume 12895, Quantum Sensing and Nano Electronics and Photonics XX; 128950E (2024) https://doi.org/10.1117/12.3001166
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
We present a photothermal spectroscopy setup based on a broadband mid-infrared quantum cascade laser frequency comb (QCL-FC). In this PTS detection scheme, local refractive index changes of the gas sample due to absorption-induced local temperature changes are detected optically by a near-infrared heterodyne interferometer. Until now, this method has been demonstrated only with single-frequency lasers in the mid-infrared region, which limits its capability of targeting broadband absorption features. The QCL-FC used in this work covers the spectral range from 7.7 to 8.2 μm with a repetition rate of 9.9 GHz. A Fourier transform spectrometer modulates the intensity of QCL-FC, which excites photothermal effect of the gas sample in a Herriott multipass cell with optical path of 76 m. Spectroscopic measurements on nitrous oxide is performed as proof of concept. This technique combines the sensitivity of PTS detection and the broadband mid-infrared coverage of QCL-FC, which has a great potential to further promote the applications of QCL-FC in trace gas sensing.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Baichuan Huang, Tommi Mikkonen, Grzegorz Gomolka, and Gerard Wysocki "Broadband mid-infrared Fourier transform photothermal spectroscopy using a quantum cascade laser frequency comb", Proc. SPIE 12895, Quantum Sensing and Nano Electronics and Photonics XX, 128950E (8 March 2024); https://doi.org/10.1117/12.3001166
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KEYWORDS
Fourier transforms
Quantum cascade lasers
Spectroscopy
Mid infrared
Frequency combs
Fourier spectroscopy
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