Ulrich Poschinger et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 S1001 doi:10.1088/0953-4075/39/19/S14
Ulrich Poschinger1, Wenzel Salzmann1, Roland Wester1, Matthias Weidemüller1, Christiane P Koch2,3 and Ronnie Kosloff2
Show affiliationsWe theoretically investigate pump-dump photoassociation of ultracold molecules with amplitude- and phase-modulated femtosecond laser pulses. For this purpose, a perturbative model for light-matter interaction is developed and combined with a genetic algorithm for adaptive feedback control of the laser pulse shapes. The model is applied to the formation of 85Rb2 molecules in a magneto-optical trap. We find that optimized pulse shapes may maximize the formation of ground state molecules in a specific vibrational state at a pump-dump delay time for which unshaped pulses lead to a minimum of the formation rate. Compared to the maximum formation rate obtained for unshaped pulses at the optimum pump-dump delay, the optimized pulses lead to a significant improvement of about 40% for the target level population. Since our model yields the spectral amplitudes and phases of the optimized pulses, the results are directly applicable in pulse shaping experiments.
33.80.-b Photon interactions with molecules
82.30.Nr Association, addition, insertion, cluster formation
33.15.Mt Rotation, vibration, and vibration-rotation constants
Issue 19 (14 October 2006)
Received 7 April 2006, in final form 19 July 2006
Published 25 September 2006
Ulrich Poschinger et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 S1001
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