Cavité à haute finesse pour la production et la détection de sources atomiques cohérentes

Abstract : This thesis reports the development of two original tools for atom interferometry.The first is a high finesse optical cavity for the manipulation of 87Rb cold atoms. This cavity isfirstly used to enhance the intensity of an optical dipole trap. Thus, by realizing an evaporativecooling on the atomic sample, we reached Bose-Einstein condensation. Furthermore, the nondegeneratecavity allows the injection of different transverse electromagnetic modes. In thisway, we have demonstrated the generation and the manipulation of arrays of atomic ensemblesusing these modes. Successive measurements of these atomic ensembles in an atominterferometric sequence would increase the interrogation time and thus the sensitivity of thesensor.Secondly, the use of weak nondestructive measurements on the atoms allows to extractinformation from the system with negligible perturbation of the ensemble. Applying feedbackafter the measurement, we were able to control the quantum state of the system. Using amodified Ramsey sequence with weak nondestructive measurements and phase corrections, werealized a phase lock loop between a local oscillator and the atomic state. We have thendemonstrated that this protocol leads to a stability enhancement of an atomic clock byovercoming the limit set by the local oscillator.We also contributed to the development of the commercial laser platform EYLSA fromQuantel, testing its performances on two laser cooling experiments.
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Submitted on : Monday, December 7, 2015 - 11:48:06 AM
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Etienne Cantin. Cavité à haute finesse pour la production et la détection de sources atomiques cohérentes. Optique / photonique. Université de Bordeaux, 2015. Français. ⟨NNT : 2015BORD0259⟩. ⟨tel-01238892⟩



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