Abstract
Coherent control calculations are presented for helium. With the help of a genetic algorithm (GA) phase-modulated extreme ultra violet (XUV) laser pulses were controlled to maximize or minimize the non-resonant two-photon 1s1s → 1s3s excitation. Linearly polarized laser pulses were chosen at the frequency of 0.4 a.u. with a duration of about 15 fs and 1014 Wcm-2 peak intensity. We verified the theory that an antisymmetric spectral phase around the two-photon resonance frequency maximizes the transition probability. Dark pulses which do not excite the system at all have however symmetric spectral phases around the two-photon resonance frequency.
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