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importance des propriétés spectrales des lasers pour les horloges atomiques à pompage optique

Abstract : This report presents theoretical and experimental results about atoms/light interactions in optically pumped cesium beam resonator. In a first part, we study how to improve the spectral purity of diode laser by use of an external cavity. Two different couplings of the active medium with the cavity are tested and compared. High-performance structures are designed, including self-alignment of the external cavity to reduce its sensitivity to mechanical and thermal perturbations. In a second part, interactions between an atomic jet and laser light are described in the density matrix approach. Laser frequency noise and modulation are considered. Optical pumping is specially studied. Its efficiency is estimated with laser parameters as intensity and modulation deep. It is showed that the atomic flux presents an extra-noise when pumping is uncompletely realized, because of the laser frequency noise. The final chapter is devoted to experimental study of the influence of laser parameters on clock signals. Pumping and detection of atoms are separetely examined. Unpumped atoms detection noise is measured and compared to theoretical predictions. Three different lasers are compared for optical pumping. The influence of bad pumping efficiency on signal-to-noise ratio of the clock signal is pointed out.
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https://tel.archives-ouvertes.fr/tel-00006254
Contributor : Gaëlle Lucas-Leclin <>
Submitted on : Friday, June 11, 2004 - 7:37:49 PM
Last modification on : Thursday, October 24, 2019 - 7:10:02 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:11:52 PM

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  • HAL Id : tel-00006254, version 1

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Gaëlle Lucas-Leclin. importance des propriétés spectrales des lasers pour les horloges atomiques à pompage optique. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 1998. Français. ⟨tel-00006254⟩

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