Physics – Atomic Physics
Scientific paper
2007-06-13
Phys. Rev. Lett. 99, 220407 (2007)
Physics
Atomic Physics
5 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.99.220407
We demonstrate superradiant conversion between a two-mode collective atomic state and a single-mode light field in an elongated cloud of Bose-condensed atoms. Two off-resonant write beams induce superradiant Raman scattering, producing two independent coherence gratings with a different wave vector in the cloud. By applying phase-matched read beams after a controllable delay, the gratings can be selectively converted into the light field also in a superradiant way. Due to the large cooperativity parameter and the small velocity width of the condensate, a high conversion efficiency of $> 70$ % and a long storage time of $> 120$ $\mu$s were achieved.
Kuga Takahiro
Nakayama Kazuyuki
Torii Yoshio
Yoshikawa Yutaka
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