Stabilization of Ultracold Molecules Using Optimal Control Theory

摘要: In recent experiments on ultracold matter, molecules have been produced from atoms by photoassociation, Feshbach resonances, and three-body recombination. The created are translationally cold, but vibrationally highly excited. This will eventually lead them to be lost the trap due collisions. We propose shaped laser pulses transfer these excited their ground vibrational level. Optimal control theory is employed find light field that carry out this task with minimum intensity. present results for sodium dimer. final target can reached within 99% provided initial guess physically motivated. optimal fields contain transition frequencies required a good Franck-Condon pumping scheme. analysis identifies ranges of intensity pulse duration which able achieve before any other competing processes take place. Such scheme could produce stable molecular samples or even Bose-Einstein condensates.