Contributors: MMTF; Laboratoire de Physique des Lasers (LPL); Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS); Laboratoire national de métrologie et d'essais - Systèmes de Référence Temps-Espace (LNE - SYRTE); Systèmes de Référence Temps Espace (SYRTE); Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS); CNRS, Agence Nationale de la Recherche (ANR BLANC LIOM 2011 BS04 009 01, ANR QUIGARDE 2012 ANR-12-ASTR-0028-03 and ANR NCPCHEM 2010 BLAN 724 3), Labex First-TF (ANR 10 LABX 48 01), AS GRAM and Université Paris 13.; ANR-11-BS04-0009,LIOM,Lien optique multiplexé pour la métrologie et la physique fondamentale(2011); ANR-10-BLAN-0724,NCPCHEM,Non-Conservation de la Parité dans les Systèmes Moléculaires(2010); ANR-12-ASTR-0028,QUIGARDE,Lasers à cascade quantiques émettant autour de 10 µm pour la détection à distance de composés gazeux(2012)
نبذة مختصرة : International audience ; Quantum Cascade Lasers (QCL) are increasingly being used to probe the mid-infrared “molecular fingerprint” region. This prompted efforts towards improving their spectral performance, in order to reach ever-higher resolution and precision. Here, we report the stabilisation of a QCL onto an optical frequency comb. We demonstrate a relative stability and accuracy of 2x10-15 and 10-14, respectively. The comb is stabilised to a remote near-infrared ultra-stable laser referenced to frequency primary standards, whose signal is transferred via an optical fibre link. The stability and frequency traceability of our QCL exceed those demonstrated so far by two orders of magnitude. As a demonstration of its capability, we then use it to perform high-resolution molecular spectroscopy. We measure absorption frequencies with an 8x10-13 relative uncertainty. This confirms the potential of this setup for ultra-high precision measurements with molecules, such as our ongoing effort towards testing the parity symmetry by probing chiral species.
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