Laser cooling of unbound atoms in nondissipative optical lattices

Details Laser cooling of unbound atoms in nondissipative optical lattices Laser cooling of unbound atoms in nondissipative optical lattices

2007-06-15

arxiv.org/abs/0706.2289v1

JETP, 2007, 105, 2, pp. 306-313

Physics

Optics

18 pages, 7 figures

Scientific paper

10.1134/S1063776107080031

The semiclassical theory of laser cooling is applied for the analysis of cooling of unbound atoms with the values of the ground and exited state angular moments 1/2 in a one-dimensional nondissipative optical lattice. We show that in the low-saturation limit with respect to the pumping field a qualitative interpretation of the cooling mechanisms can be made by the consideration of effective two-level system of the ground-state sublevels. It is clarified that in the limit of weak Raman transitions the cooling mechanism is similar to the Doppler mechanism, which is known in the theory of two-level atom. In the limit of strong Raman transitions the cooling mechanism is similar to the known Sisyphus mechanism. In the slow atom approximation the analytical expressions for the coefficients of friction, spontaneous and induced diffusion are given, and the kinetic temperature is estimated.

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