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Springer series in optical sciences/SPringer series in optical sciences

Deflection of a Sodium Atomic Beam by Light Pressure Exerted by Absorption from a Multiple Laser Beam

W. Yuzhu, Z. Rufang, Z. Zhiyao, C. Waiquan, Nie Guoquan

Published Jan 1, 1983• 0 citations
Publisher
DOI
10.1007/978-3-540-38814-2_5

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We report the efficient transverse deflection of all atoms in a well-collimated sodium atomic beam by the spontaneous radiation pressure of a beam of resonance light which illuminates the atomic beam at right angles. Our results are obtained using two cw single-mode dye lasers to excite the two ground-state levels of sodium; this enables all atoms to interact with the light and it also eliminates optical pumping of the ground state. We obtained deflection angles greater than 5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$ rad which was ten times the divergence angle of the undeflected atomic beam; these deflections are due to the spontaneous scattering of more than 200 photons by each atom. The distribution of deflection angles is well described by a simple calculation. Fitting theory to experiment indicates that a fractional atomic excitation of 24 percent was obtained at an intensity of approximately 1 W/cm2{\mathrm{cm}}^{2}cm2. When single-frequency light was used, only a fraction of the atoms were deflected, and the deflection angles were much smaller due to optical pumping.