Comptes Rendus
Ultra narrow linewidth frequency reference via measurement and feedback
[Étalon de fréquence à largeur de raie étroite par mesure et rétroaction]
Comptes Rendus. Physique, Volume 24 (2023) no. S3, pp. 55-68.

L’obtention de sources lumineuses à largeur de raie étroite revêt une grande importance dans la science moderne. Une de ces sources est le laser superradiant, qui met en jeu des dipôles à très longue durée de vie interagissant collectivement et forcés par un champ lumineux incohérent. Nous discutons ici d’une autre manière d’obtenir une source spectralement pure, par forçage cohérent de tels dipôles dans une cavité optique QED (en régime de couplage fort). Le champ qui sort de la cavité est porteur d’informations sur le désaccord en fréquence entre le champ de forçage et la transition atomique, mais il est également affecté par le bruit dû aux processus de décohérence à l’oeuvre dans le système combiné atomes-cavité. Nous tenons compte de ces effets pour déterminer les limites fondamentales sur la mesure de la fréquence et sa stabilisation, en fonction des intensités lumineuses d’entrée et des amplitudes de couplage atomes-champ, puis nous estimons ces limites dans l’état de l’art des expériences en cavité sur des atomes alcalino-terreux et nous déterminons les régimes de fonctionnement favorables. Nous trouvons que les largeurs de raie accessibles sont comparables à celles du laser superradiant.

The generation of very narrow linewidth light sources is of great importance in modern science. One such source is the superradiant laser, which relies on collectively interacting ultra long lived dipoles driven by incoherent light. Here we discuss a different way of generating spectrally pure light by coherently driving such dipoles inside an optical QED cavity. The light exiting cavity carries information about the detuning between the driving light and the atomic transition, but is also affected by the noise originating from all the decoherence processes that act on the combined atom-cavity system. We calculate these effects to obtain fundamental limits for frequency estimation and stabilization across a range of values of input light intensities and atom-light interaction strengths, estimate these limits in state-of-the-art cavity experiments with alkaline-earth atoms and identify favorable operating conditions. We find that the achievable linewidths are comparable to those of the superradiant laser.

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DOI : 10.5802/crphys.146
Keywords: Quantum optics, Superradiance, Cavity quantum electrodynamics, Feedback, Lasers
Mot clés : Optique quantique, Superradiance, Électrodynamique quantique en cavité, Rétroaction, Lasers

Diego Barberena 1, 2 ; Robert J. Lewis-Swan 3, 4 ; Ana Maria Rey 1, 2 ; James K. Thompson 1

1 JILA, NIST, Department of Physics, University of Colorado, Boulder, CO 80309, USA
2 Center for Theory of Quantum Matter, University of Colorado, Boulder, CO 80309, USA
3 Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, Norman, OK 73019, USA
4 Center for Quantum Research and Technology, The University of Oklahoma, Norman, OK 73019, USA
Licence : CC-BY 4.0
Droits d'auteur : Les auteurs conservent leurs droits
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     title = {Ultra narrow linewidth frequency reference via measurement and feedback},
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Diego Barberena; Robert J. Lewis-Swan; Ana Maria Rey; James K. Thompson. Ultra narrow linewidth frequency reference via measurement and feedback. Comptes Rendus. Physique, Volume 24 (2023) no. S3, pp. 55-68. doi : 10.5802/crphys.146. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.146/

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