Frequency dependent optimization of the ionization process in NaK by means of fs-pulses

Frequency dependent closed loop optimization of fs pulse shapes is investigated for the NaK dimer. By controlling the photo-excited wave packet dynamics, the three-photon ionization of NaK is optimized. The obtained ion yield depending on the employed central laser frequency shows a maximum in the range of 770-780 nm. By investigating the modifications of the optimal pulse shapes for different wavelengths one could gain information about the associated ionization path during the control process. Characteristic motions of the involved wave packets are proposed as an attempt to explain the optimized dynamical processes