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Physical Review A

Suppression of incoherent ionization in population transfer via continuum

Razmik G. Unanyan, Nikolay V. Vitanov, Stig Stenholm

Published Jan 1, 1998• 36 citations
Publisher

Abstract

We show that the efficiency of population transfer between two discrete states via a common continuum can be considerably improved by suppressing the incoherent ionization with a third laser pulse using a Fano-type resonance.
DOI
10.1103/physreva.57.462

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Two laser pulses that overlap in time have been successfully used for coherent excitation of a molecule or atom to a desired state. An intermediate state that is at or near resonance with the laser frequencies has been used in past experiments and calculations. Here we replace this intermediate state by a continuum of intermediate states. An analytic solution of a simple model suggests that the continuum can be used in such an excitation scheme, provided that the laser pulses are arranged in the so-called counterintuitive order. We use a special case of this solution to relate this work to ionization suppression and coherent population trapping.
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This paper reviews some basic techniques and theories for laser-induced incoherent population transfer schemes and resonant coherent excitation. By numerical simulations based on self-consistent set of density matrix equations and Maxwell equations, the authors have found this control can be achievable with great robustness and efficiency in nanosecond time scale using two pulses with proper selection of sequence timing to prepare the state for coherence superposition and population transfer with effective suppression of spontaneous emission.
Transfer of molecules or atoms from an initial state to a certain final state is often wanted, and use of a single laser may be impractical. Transfer via an intermediate state of higher energy has been demonstrated, using laser pulses that overlap in time. We have proposed using the continuum in place of the intermediate state, and encouraging results have been computed for a simple model. Our latest calculations show the effects of operating this scheme near the bottom of the continuum or near a resonance having the Fano shape, and the effects of laser-driven continuum-continuum transitions.