[Un cadre pour le fonctionnement continu d’un laser superradiant par transport séquentiel d’atomes]
We perform a theoretical study of a continuous superradiant laser supporting its experimental realization at FEMTO-ST using two sequentially-emitting ensembles of 171Yb atoms coupled to the same Fabry–Perot cavity. Using an open quantum system approach, we identify for the simplest case the parameter space where the laser reaches tens of picowatts of power with a sub-millihertz linewidth. Studying the impact of inhomogeneous frequency broadening and variations in atom-cavity coupling on the superradiant emission, we find the laser properties robust with respect to such perturbations, also thanks to the occurrence of synchronization of the atomic dipoles. We then consider a two-site configuration, in which atoms in each site are equally coupled to the cavity and have equal detunings, with different values for the two ensembles. We find for balanced and imbalanced atom numbers that synchronization leads in a certain parameter space to a single narrow spectral line whose central frequency follows the weighted average frequency. This result indicates that sequential loading can enable continuous superradiant emission for metrological applications, provided that the relative frequencies of the two ensembles are controlled to the level required by the target stability.
Nous réalisons une étude théorique d’un laser superradiant continu en vue de son implantation expérimentale à FEMTO-ST utilisant deux ensembles d’atomes de 171Yb émettant séquentiellement dans une même cavité Fabry–Perot. En adoptant l’approche des systèmes quantiques ouverts, nous identifions dans le cas le plus simple l’espace des paramètres pour lequel le laser atteint des puissances de l’ordre de dizaines de picowatts avec une largeur de raie inférieure au millihertz. En étudiant l’impact de l’élargissement inhomogène de la fréquence et des variations du couplage atome-cavité sur l’émission superradiante, nous montrons que les propriétés du laser restent robustes face à de telles perturbations, notamment grâce à l’apparition d’une synchronisation des dipôles atomique. Nous considérons ensuite une configuration à deux sites, dans laquelle les atomes au sein de chaque site sont également couplés à la cavité et présentent le même désaccord en fréquence, avec des valeurs différentes pour les deux ensembles. Nous montrons pour des nombres d’atomes égaux et inégaux que la synchronisation peut conduire à une raie spectrale unique et étroite dont la fréquence centrale suit la moyenne pondérée des fréquences. Ce résultat indique que le chargement séquentiel peut permettre une émission superradiante continue pour des applications métrologiques, à condition que les fréquences relatives des deux ensembles soient contrôlées au niveau requis.
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Mots-clés : Superradiance, systèmes quantiques ouverts, métrologie temps-fréquence
Jana El Badawi 1 , 2 ; Marion Delehaye 1 ; Bruno Bellomo 2
CC-BY 4.0
@article{CRPHYS_2026__27_G1_191_0,
author = {Jana El Badawi and Marion Delehaye and Bruno Bellomo},
title = {A framework for continuous superradiant laser operation via sequential transport of atoms},
journal = {Comptes Rendus. Physique},
pages = {191--216},
year = {2026},
publisher = {Acad\'emie des sciences, Paris},
volume = {27},
doi = {10.5802/crphys.277},
language = {en},
}
TY - JOUR AU - Jana El Badawi AU - Marion Delehaye AU - Bruno Bellomo TI - A framework for continuous superradiant laser operation via sequential transport of atoms JO - Comptes Rendus. Physique PY - 2026 SP - 191 EP - 216 VL - 27 PB - Académie des sciences, Paris DO - 10.5802/crphys.277 LA - en ID - CRPHYS_2026__27_G1_191_0 ER -
%0 Journal Article %A Jana El Badawi %A Marion Delehaye %A Bruno Bellomo %T A framework for continuous superradiant laser operation via sequential transport of atoms %J Comptes Rendus. Physique %D 2026 %P 191-216 %V 27 %I Académie des sciences, Paris %R 10.5802/crphys.277 %G en %F CRPHYS_2026__27_G1_191_0
Jana El Badawi; Marion Delehaye; Bruno Bellomo. A framework for continuous superradiant laser operation via sequential transport of atoms. Comptes Rendus. Physique, Volume 27 (2026), pp. 191-216. doi: 10.5802/crphys.277
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