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Voies ouvertes par des cellules en saphir pour des expériences de violation de parité détectée par émission stimulée

Abstract : We study the improvements and limits obtained by
using sapphire cesium cells in an atomic physics experiment aiming at a precise
measurement of a parity violation (PV) effect, associated with the exchange of
Zo bosons in the cesium atom. Such a measurement provides a test of the
electroweak model at very low energy. Our experiment is of the pump-probe kind,
performed on the 6S1/2-7S1/2-6P3/2 transition in a dense cesium
vapor, subjected to an electric field E=2kV/cm, static on the time
scale of the laser pulses. With the configuration studied before this thesis
( E-field along the laser beams), the sapphire cells have allowed us to
overcome several limits encountered with the previous glass cells: (i) sapphire
windows are totally immune to the experimental conditions (ii)Cs2 dimers
can be thermally destroyed by overheating the vapor (iii) the production of the E-field
in the cell with external electrodes ensures a fair reduction of the surface
resistive currents inside the cell. Nevertheless, the excitation laser pulse
induce electron emission from the windows and we observed the multiplication of
charges accelerated by the E-field. Perturbations associated with
space charge and electron currents presently limit the precision of a PV
measurement in this configuration. Next, we began studying of a new
experimental configuration, where the E-field is perpendicular to the
laser beams. This was easy to implement using the sapphire cells since we could
use external electrodes. The first experimental step has been the determination
of the correct parameters for measurements of longitudinal and (with Larmor
precession) transverse atomic orientations in the 7S state, using pulsed
pump-probe polarimetry, and stimulated detection. We have also measured the
E-field in situ for both longitudinal and transverse
configuration. Such a determination is crucial for the analysis of longitudinal
configuration PV data.
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https://tel.archives-ouvertes.fr/tel-00000883
Contributor : Erwan Jahier <>
Submitted on : Friday, November 23, 2001 - 3:56:17 PM
Last modification on : Thursday, October 29, 2020 - 3:01:20 PM
Long-term archiving on: : Friday, April 2, 2010 - 5:58:45 PM

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  • HAL Id : tel-00000883, version 1

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Erwan Jahier. Voies ouvertes par des cellules en saphir pour des expériences de violation de parité détectée par émission stimulée. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2001. Français. ⟨tel-00000883⟩

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