Phys. Rev. A 74, 023408 (2006) [6 pages]Dark pulses for resonant two-photon transitionsReceived 22 March 2006; published 23 August 2006 We investigate the excitation of an atom or molecule via two-photon absorption induced by an ultrashort laser pulse in the perturbative intensity regime. We show that the probability for a resonant transition, i.e., with an intermediate state within the spectral width of the pulse, can be reduced to zero by pulses having a θ-phase step at a certain detuning δω from the central frequency. Our theoretical predictions are confirmed by numerical calculations for the 4s→4d transition in the potassium atom. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.74.023408
DOI:
10.1103/PhysRevA.74.023408
PACS:
32.80.Qk, 32.80.Wr, 42.65.Re
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