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Chinese Physics Letters

A new method of isotope separation by means of laser deflection of an atomic beam

Liang Liu, Yuzhu Wang

Published Nov 1, 1986• 1 citation
Publisher

Abstract

The radiation pressure produced by two-laser fields on a two-level atom is obtained. These results show that the radiation pressure produced by two-laser fields with appropriate detunings with atom is much greater than that produced by a single-laser field. This great radiation pressure is possible to be applied to isotope separation by laser deflection of an atomic beam.

DOI
10.1088/0256-307x/3/11/005

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Soviet physics. Technical physics•Sep 1, 1985•0 citations
The radiation pressure produced by two-laser fields on a two-level atom is obtained. These results show that the radiation pressure produced by two-laser fields with appropriate detunings with atom is much greater than that produced by a single-laser field. This great radiation pressure is possible to be applied to isotope separation by laser deflection of an atomic beam.
Limitations of existing methods of isotope separation, using atomic beam deflection induced by radiation pressure, are discussed. A new method, based on selective momentum transfer by intense unchirped reflected laser pulses, is proposed. The pulses produce population inversion in one isotope leaving the other unaffected. This population inversion is obtained using isotope selective optical precession. The method is supported by the full solution of the equations of motion of a two-level atom interacting with realistic light pulses of arbitrary strength.
Isotope separation by laser deflecting an atomic beam is analyzed theoretically. Interacting with a tilted one-dimensional optical molasses, an ytterbium atomic beam is split into multi-beams with different isotopes like 172 Yb, 173 Yb, and 174 Yb. By using the numerical calculation, the dependences of the splitting angle on the molasses laser intensity and detuning are studied, and the optimal parameters for the isotope separation are also investigated. Furthermore, the isotope separation efficiency and purity are estimated. Finally a new scheme for the efficient isotope separation is proposed. These findings will give a guideline for simply obtaining pure isotopes of various elements.
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.