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The properties of pulse-train induced multiphoton excitation in anharmonic progressions and the accumulation of population in a specific rung state are investigated by means of numerical simulations. It is shown how and under which conditions resonant π-pulses and multiple-π pulses can be split into trains of fractional π-pulses driving the same transition. Standardized train forms are considered...
Single pulse dipole mediated tunnelling at frequencies tuned approximately to the vicinity of the direct 1-photon and multiphoton tunnel transitions is explored as a mechanism of population transfer across asymmetric dipolar 3-level lambda- (Λ-) or N-level extended Λ-systems. These systems may be purely sequentially coupled, with zero dipole matrix coupling elements for non-neighbouring states along...
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