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Amplification of electroweak left-right asymmetry in atoms by stimulated emission
Authors:C. Bouchiat  M. -A. Bouchiat
Affiliation:1. Laboratoire de Physique Théorique de l'école Normale Supérieure, 24 rue Lhomond, F-75231, Paris Cedex 05, France
2. Laboratoire Kastler-Brossel, 24 rue Lhomond, F-75231, Paris Cedex 05, France
Abstract:This work describes quantitatively the amplification of the electroweak left-right asymmetry, a remarkable and attractive feature of the experiment in progress on the 6S 1/2 → 7S 1/2 cesium transition using detection by stimulated emission on the 7S 1/2 → 6P 3/2 transition. The process relies on the optical anisotropy of the atomic medium resulting from the 7S 1/2 alignment created by excitation with linearly polarized light. The crucial parameter (α)/α involves the amplification coefficients for the probe field oriented in a direction either parallel or perpendicular to the alignment axis. Explicit computations are done by a semiclassical approach (classical for the field, quantum mechanical for the atomic states). The larger the optical anisotropy and the optical density, the stronger the asymmetry amplification; among all hyperfine components of the 7S 1/2 → 6P 3/2 transition, the ΔF=0 ones and more particularly the 4 → 4 offer the largest anisotropy. It is also predicted that saturation of the probe transition by the optical field should provide manifestation of the effect at lower optical densities and notwithstanding at larger fluxes of transmitted photons. Indirect production of 6P 3/2 atoms by the excitation pulse does not reduce the left-right asymmetry, neither its amplification which then appears at lower effective optical densities.
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