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Quantum dynamical calculations of ultracold collisions induced by nonlinearly chirped light
S. Kallush [1] , J. L. Carini [2] , J. A. Pechkis [2] , C. E. Rogers III [2] , P. L. Gould [2] , R. Kosloff [3]
[1] Department of Physics and Optical Engineering, ORT Braude, P.O. Box 78, Karmiel, Israel
[2] Department of Physics, University of Connecticut, Storrs, CT 06269, USA
[3] Department of Physical Chemistry and the Fritz Haber Research Center for Molecular Dynamics, The Hebrew University, 91094, Jerusalem, Israel
We describe quantum dynamical calculations of ultracold 85Rb trap-loss collisions induced by pulses of light whose frequency is chirped on the nanosecond time scale. The chirped light excites the ground-state collisional wavefunction to the long-range attractive potential and escape from the trap is modeled by an absorbing boundary at short range. Both positive and negative chirps are considered and various chirp shapes and detunings are examined. For positive chirps, the loss rates are rather independent of the chirp shape. Negative chirps, on the other hand, show a dependence on chirp shape for detunings where collisional flux can be coherently returned to the ground state. These trends are consistent with the results of a recent experiment.