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Laser à semiconducteur pompé optiquement bifréquence pour les horloges à atomiques à piégeage cohérent d'atomes de Césium

Paul Dumont 1
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : Atomic clocks using the coherent population trapping (CPT) technic are ex-cellent candidates to obtain frequency references that are stable, compact and with a low powerconsumption. In the case of cesium atomic clocks, this technic require a dual-frequency laserfield either at 895 nm (D1 transition) or 852 nm (D2 transition) whose frequency difference isequal to 9.19 GHz, the frequency splitting between the two hyperfine levels of the fundamentalstate. Here we present a new concept for generating this type of laser field using a unique dualfrequency and optically-pumped laser with a dual-polarized emission.In this manuscript, we study the conception of such a laser source at a wavelength of 852 nm.We detail the design of the intracavity elements and the semiconductor active structure. Thenwe describe the experimental set-up and characterization of a first prototype. We present thestabilization set-up of the laser based on two different servo-loops, one used to lock the opticalfrequency onto the cesium transition and the other to lock the frequency difference onto thefrequency generated by a local oscillator. We report a complete simulation and characterizationof the main laser noises: the laser intensity noise, the optical frequency noise, and the phase noiseof the radiofrequency signal generated by the beatnote of the two laser modes. We show the firstexperimental results of coherent population trapping obtained with the prototype. Finally weestablish a noise budget of a CPT atomic clock by estimating the impact of each laser noises.After we identify the system limits, we propose different ways to improve the dual-frequencywhich rely on the reduction of the intensity noise and the modification of the semiconductorstructure design.
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https://pastel.archives-ouvertes.fr/tel-01469227
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  • HAL Id : tel-01469227, version 1

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Paul Dumont. Laser à semiconducteur pompé optiquement bifréquence pour les horloges à atomiques à piégeage cohérent d'atomes de Césium. Optique [physics.optics]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLO012⟩. ⟨tel-01469227⟩

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