A stochastic rainbow caustic observed with cold atoms

Details A stochastic rainbow caustic observed with cold atoms A stochastic rainbow caustic observed with cold atoms

2001-01-25

arxiv.org/abs/physics/0101088v2

Phys. Rev. A 64, 065403 (2001)

Physics

Atomic Physics

4 pages, 4 figures, somewhat shortened version

Scientific paper

10.1103/PhysRevA.64.065403

We report the direct observation of a novel type of rainbow caustic. In contrast to known examples, this caustic originates from a dissipative, stochastic process. We have observed this using cold ^{87}Rb atoms bouncing inelastically on an evanescent-wave atom mirror. The caustic appears as a sharp peak at the lower edge of the asymmetric velocity distribution of the bouncing atoms. The stochastic process is a spontaneous Raman transition due to photon scattering during the bounce. The results are in good agreement with a classical calculation.

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