Eur. Phys. J. D 42, 217-220 (2007)
https://doi.org/10.1140/epjd/e2007-00021-1

Isotopomer selective optimization of ³⁹K⁸⁵Rb⁺ and ⁴¹K⁸⁷Rb⁺ using optimal control

Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Corresponding author: ^a merli@physik.fu-berlin.de

Received: 8 June 2006
Revised: 17 November 2006
Published online: 31 January 2007

Abstract

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.