Momentum control in photoassociation of ultracold atoms

S. Kallush*, R. Kosloff

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Ultracold photoassociation is a process in which two cold atoms combine to form a molecule. This process is crucially dependent on the atom pair density at close distance termed the photoassociation window. We explore the possibilities for increasing the pair density at the photoassociation window by using a prepulse to accelerate the pairs of atoms at large interatomic separation toward each other. We show that the signal of a subsequent photoassociation pulse could be enhanced by a factor of one to two orders of magnitude with respect to the conventional continuous wave experiment. For neutral encounters on the ground potential surface which scales as R-6 the acceleration becomes negligible. The electronic excited state potentials scale for homonuclear S→P transitions more favorably as R-3. A possible pump-dump mechanism for acceleration, excites a pair of atoms at large distance employing the natural acceleration on the excited state. Then a dump pulse moves the population back to the ground surface. By controlling the phase and the amplitude of the light field this scenario can be optimized. In addition the momentum partitioned between the ground and excited surfaces can also be controlled. The possibility for pure quantum light-induced acceleration due to a gradient of the transition dipole is analyzed. Significant acceleration can be obtained only for pulses with intensities above 1014 W/cm2 and pulse duration of 10 ps.

Original languageEnglish
Article number053408
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume76
Issue number5
DOIs
StatePublished - 12 Nov 2007

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