Journal
PHYSICAL REVIEW A
Volume 86, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.86.033426
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Funding
- NordForsk Researcher Network Time-domain quantum processes studied by ultrafast pulses
- Danish Research Council [10-085430]
- ERC-StG [277767]
- Academy of Finland
- European Research Council (ERC) [277767] Funding Source: European Research Council (ERC)
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In recent attempts to control strong-field phenomena such as molecular dissociation, undesired ionization sometimes seriously limited the outcome. In this work we examine the capability of quantum optimal control theory to suppress the ionization by rational pulse shaping. Using a simple model system and the ground-state occupation as the target functional, we show that optimal control generally leads to a significant suppression of the ionization, although the fluence and the pulse length are kept fixed. In the low-frequency regime the ionization is reduced mainly by avoiding high peaks in the intensity and thus preventing tunneling. In contrast, at high frequencies in the extreme ultraviolet regime the optimized pulses strongly couple with the (de)-excitations of the system, which leads to different pulse characteristics. Finally, we show that the applied target functional works, to some extent, for the enhancement of the high-order-harmonic generation, although further developments in optimal control theory to find proper target functionals are required.
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