Isotopomer selective optimization of 39K85Rb+ and 41K87Rb+ using optimal control
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We report on isotope selective three-photon ionization of two isotopomers of KRb by applying evolution strategies. The particularity of this experiment is based on the high resolution phase and amplitude modulation of the fs-laser pulses provided by a 2 × 640 pixel pulse shaper. The optimization in a closed feedback loop performed with spectrally broad pulses centered at 840 nm shows high enhancements of one isotopomer at the expense of the other isotopomer and vice versa. From the optimal laser field we aim to gain details about the selective ionization sequence and the wavepacket evolution on the involved vibrational states.
PACS.82.53.-k Femtochemistry 28.60.+s Isotope separation and enrichment 33.80.Rv Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)
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