Theoretical model for ultracold molecule formation via adaptive feedback control

Abstract

We investigate pump-dump photoassociation of ultracold molecules with amplitude- and phase-modulated femtosecond laser pulses. For this purpose a perturbative model for the 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 for optimized pulse shapes an improvement for the formation of ground state molecules by more than a factor of 10 compared to unshaped pulses at the same pump-dump delay time, and by 40% compared to unshaped pulses at the respective optimal pump-dump delay time. Since our model yields directly the spectral amplitudes and phases of the optimized pulses, the results are directly applicable in pulse shaping experiments.

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Cited by in corpus (8)

• Formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics
• Coherent Control of Ultracold Collisions with Chirped Light: Direction Matters
• Enhancement of Ultracold Molecule Formation Using Shaped Nanosecond Frequency Chirps
• Photoassociation and coherent transient dynamics in the interaction of ultracold rubidium atoms with shaped femtosecond pulses - II. Theory
• Coherent control of ultracold 85Rb trap-loss collisions with nonlinearly frequency-chirped light
• Efficient Formation of Ultracold Molecules with Chirped Nanosecond Pulses
• Probing Ultracold Collisional Dynamics with Frequency-Chirped Pulses
• Demonstrating coherent control in 85Rb2 using ultrafast laser pulses: a theoretical outline of two experiments