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Absolute frequency referencing in the long wave infrared using a quantum cascade laser frequency comb
Auteur(s)
Gianella, Michele
Jouy, Pierre
Kapsalidis, Filippos
Shahmohammadi, Mehran
Beck, Mattias
Hugi, Andreas
Faist, Jérôme
Emmenegger, Lukas
Date de parution
2022-4-4
In
Optics Express
Vol.
8
No
30
De la page
12891
A la page
12901
Revu par les pairs
1
Résumé
Optical frequency combs (OFCs) based on quantum cascade lasers (QCLs) have transformed mid-infrared spectroscopy. However, QCL-OFCs have not yet been exploited to provide a broadband absolute frequency reference. We demonstrate this possibility by performing comb-calibrated spectroscopy at 7.7 µm (1305 cm−1) using a QCL-OFC referenced to a molecular transition. We obtain 1.5·10−10 relative frequency stability (100-s integration time) and 3·10−9 relative frequency accuracy, comparable with state-of-the-art solutions relying on nonlinear frequency conversion. We show that QCL-OFCs can be locked with sub-Hz-level stability to a reference for hours, thus promising their use as metrological tools for the mid-infrared.
Identifiants
Type de publication
journal article
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