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Optics Communications

Population transfer through the continuum with temporally delayed chirped laser pulses

Emmanuel Paspalakis, M. Protopapas, P. L. Knight

Published Oct 1, 1997• 43 citations
Publisher
DOI
10.1016/s0030-4018(97)00254-x

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We study the dynamics of chirped adiabatic passage (CHIRAP) with temporally delayed pulses to selectively and fully transfer population in atoms and molecules. We show that the transfer of population via stimulated Raman adiabatic passage (STIRAP) and stimulated two-photon adiabatic absorption with temporally delayed laser pulses is not adversely affected by applying a chirp to the pulses, provided the intensity of the laser is sufficiently large to allow adiabatic passage. We then proceed to consider systems in which a near degeneracy of terminal state levels results in nonselective population of the terminal levels using nonchirped STIRAP or two-photon absorption stimulated passage, because the dynamics within the nearly degenerate pair of levels is not adiabatic. However, the CHIRAP process selectively populates only one of the terminal levels.
We study the possibility of transferring population between two bound atomic or molecular states via an autoionizing state. Conditions for efficient transfer are given and the effects of the AC Stark shifts, the Fano parameters and the incoherent channels of ionization are explored. An adiabatic analytic solution which helps in the understanding of the behaviour of the system is also given. Efficient transfer is realized by using both a counterintuitive pulse sequence and concurrent laser pulses.