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JETP Lett. (Engl. Transl.); (United States)

Radiative collimation of an atomic beam by two-dimensional cooling by a laser beam

V. I. Balykin, Vladilen S Letokhov, A. I. Sidorov

Published Sep 25, 1984• 5 citations
OpenAlex

Abstract

Two-dimensional radiative cooling of a beam of sodium atoms by radiation-pressure forces has been studied in an axisymmetric standing light wave. The temperature of the transverse motion of the atoms was reduced to 3.5 mK.

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International Laser Science Conference•Jan 1, 1986•0 citations
The transverse cooling of a beam of sodium atoms in an axisymmetric light field formed by a reflecting axicon is studied. It is shown that transverse cooling leads to a decrease in angular divergence (collimation) of the atomic beam. The transverse velocities of the beam are reduced from 5.5 × 102 to 1.6 × 102 cm/sec, which corresponds to the decrease in effective transverse temperature of the beam from T = 42 to T = 3.3 mK. The spatial and velocity distributions of the atomic beam are calculated numerically. It is found that theory and experiment are in good agreement.
The use of resonant radiation pressure produced by an axisymmetric light field for collimating atomic beams is considered. As an example the possibility is examined of collimating an atomic beam by the light field created by reflecting a plane wave from the inner surface of a metal cone. It is shown that radiation pressure makes it possible to reduce the transverse velocities of an atomic beam to values of order 100 cm/s, which corresponds to an effective temperature on the order of 0.001 K. A method for obtaining collimated beams of cold atoms that is based on combined slowing-down and collimation of atom beams in response to the pressure of resonant laser radiation is examined. 16 references.
This paper presents the results of experimental and theoretical investigations on the control of atomic beam motion by light pressure of laser radiation. Collimation, focusing, and compression of an atomic beam are considered. Collimation of an atomic beam was achieved under the interaction of laser radiation with atoms when the light pressure force depended only on the atoms’ velocity. A similar regime of atomic beam interaction with radiation was performed under transversal irradiation of a beam by the axisymmetric field. The latter was formed by laser radiation reflected from the conical mirror surface of a reflecting axicon. The axis of an atomic beam coincided with that of the axicon. The collimation regime was reached under negative detuning of the laser radiation frequency from that of the atomic transition one by a value equal to a few homogeneous widths. Under positive detuning by the same value beam decollimation was observed.