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5 March 2021 Quantum cascade laser combs for spectroscopy
Jérôme Faist
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Proceedings Volume 11705, Novel In-Plane Semiconductor Lasers XX; 117050Q (2021) https://doi.org/10.1117/12.2578485
Event: SPIE OPTO, 2021, Online Only
Abstract
Quantum cascade laser optical frequency combs are opening new possibilities in mid-infrared spectroscopy. Using a dual comb spectroscopy, spectrum acquisition at 8um were achieved with a very short time resolution (10us) and very high accuracy (1m Absorbance); using interleaving techniques high resolution (~3MHz) measurements over a full bandwidth of 55cm-1 with an acquisition time of only 120ms were achieved. In this context, we discuss improvement of the QCL comb stability using ring QCLs geometries, RF injection in specially designed devices. Furthermore, we perform the comparison between the coherent intermode beat spectroscopy and upconversion of the output intensity as characterization tools for the comb.
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Jérôme Faist "Quantum cascade laser combs for spectroscopy", Proc. SPIE 11705, Novel In-Plane Semiconductor Lasers XX, 117050Q (5 March 2021); https://doi.org/10.1117/12.2578485
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KEYWORDS
Quantum cascade lasers
Spectroscopy
Laser spectroscopy
Absorbance
Frequency combs
Laser optics
Mid-IR
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