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13 March 2024 Fast rotational mid-IR spectroscopy with broadband quantum cascade lasers
Alessio Cargioli, Diego Piciocchi, Mathieu Bertrand, Sergej Markmann, Martin Franckié, Mehran Shahmohammadi, Andres Forrer, Pierre Jouy, Richard Maulini, Stéphane Blaser, Tobias Gresch, Antoine Muller, Mattias Beck, Jerome Faist, Giacomo Scalari
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Proceedings Volume PC12905, Novel In-Plane Semiconductor Lasers XXIII; PC1290507 (2024) https://doi.org/10.1117/12.2692636
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
Standard Fourier Transform Infrared Spectrometers (FTIR) rely on a Michelson Interferometer scheme which uses a linear delay line to retrieve an interference pattern. Here, we demonstrate a fast FTIR based on a rotational delay line which allows us to achieve kHz acquisition rates. We perform spectrometry measurements using it in combination either with a Mid-IR Quantum Cascade Laser (QCL) frequency comb or a strongly, low-frequency, RF-modulated QCL. Regarding the latter, the modulation enables to broaden the laser emission up to 250cm^-1 (from 6.5µm to 7.5µm) and to reduce its amplitude noise compared to the free-running case. The combination of a strongly modulated QCL with a rotational FTIR opens the possibility to fast and broadband spectroscopy in the Mid-IR region, with possible applications spanning from gas detection to process control
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Alessio Cargioli, Diego Piciocchi, Mathieu Bertrand, Sergej Markmann, Martin Franckié, Mehran Shahmohammadi, Andres Forrer, Pierre Jouy, Richard Maulini, Stéphane Blaser, Tobias Gresch, Antoine Muller, Mattias Beck, Jerome Faist, and Giacomo Scalari "Fast rotational mid-IR spectroscopy with broadband quantum cascade lasers", Proc. SPIE PC12905, Novel In-Plane Semiconductor Lasers XXIII, PC1290507 (13 March 2024); https://doi.org/10.1117/12.2692636
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KEYWORDS
Quantum cascade lasers
Mid-IR
Spectroscopy
FT-IR spectroscopy
Modulation
Process control
Quantum amplitude
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