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European Quantum Electronics Conference (EQEC)

Excitation dynamics in resonance enhanced multiphoton ionization of atoms with short intense laser pulses

Rutger B. Vrijen, Lambertus D. Noordam

Published Aug 24, 2005• 0 citations
Publisher
DOI
10.1109/eqec.1994.698316

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Based on the time-dependent density-matrix equations of two-level system,the analytical formule of the resonance-enhanced multiphoton ionization(REMPI) probabilities of atom were obtained under the resonant and near-resonant condition.Furthermore,for the(2+1) REMPI of oxygen atom with the 2p~34p as resonant state,the dependence of the ionization probability on laser intensity,pulse width and resonance detuning was discussed.At the same time,the relation of the saturation condition of REMPI to the laser intensity and the pulse width was derived.Under the near-resonant condition,the analytical results showed that the ionization probability decreased with the increase of resonance detuning with the fixed laser intensity and pulse width,and the ionization probability increased with the increase of laser intensity at the fixed resonance detuning and tended to become saturation when laser intensity was high enough.Under the resonant condition,the amplitude of the ionization probability increased rapidly with the pulse width when laser intensity increased.