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Quantum Electronics and Laser Science Conference

Cooperative Effects In Laser-induced Ultracold Collisions

S. D. Gensemer, V. Sánchez-Villicaña, S. Ciris, P. L. Gould

Published May 18, 1997• 0 citations
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In laser-induced collisions between ultracold atoms, the combination of low velocities and long-range interactions results in collision times which can exceed the excited-state lifetime. We use a cooperative effect between two lasers to explicitly observe this time dependence. The first laser, tuned near resonance, excites the atom pair at long range and enhances the collisional flux available for short-range excitation by a second, far-detuned laser. Using pulsed excitation, we find this collisional process to take place on a ${10}^{\ensuremath{-}6}\mathrm{s}$ time scale, in reasonable agreement with trajectory simulations.
We have observed a significant cooperative effect in ultracold trap loss collisions induced by two separate lasers. One laser, tuned close to the atomic resonance, excites the atom pair to an attractive potential at long range. The resulting acceleration and deflection give rise to an enhancement in the collisional flux of ground-state atoms reaching short range, as probed by a second laser. Enhancements up to a factor of \ensuremath{\sim}3 have been observed. This indicates that the atomic pair-distribution function can be significantly distorted in a typical laser trap environment.