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Journal of Modern Optics

Effects of laser phases on photoionization and coherent population trapping in a two-channel ionization system

Gao‐xiang Li, Jin-sheng Peng, Peng Zhou

Published Mar 1, 1997• 5 citations
Publisher

Abstract

We have studied the effects of laser phases on photoionization rate and atomic coherent population trapping in a two-channel ionization system. A dressed-state analysis is given to explain the appearance of phase-dependent atomic coherent population trapping.
DOI
10.1080/09500349708232917

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A theoretical analysis of the phase control of a two-channel atomic ionization scheme is given. We report results on phase-selective excitation, both with square and smooth laser pulses. We show that the phenomenon of population trapping, which is known to occur in this system, can be greatly influenced by the phase difference of the lasers involved in the excitation. As a result, the time dependences of the ionization probability, the populations in the bound states and the form of the photoelectron energy spectra can all be controlled by varying the phase difference of the lasers. We also show that for specific atomic and phase parameters population can be entirely trapped within a superposition state, totally immune to decay, with no ionization whatsoever.
A theoretical analysis of the phase control of a two-channel atomic ionization scheme is given. We report results on phase-selective excitation, both with square and smooth laser pulses. We show that the phenomenon of population trapping, which is known to occur in this system, can be greatly influenced by the phase difference of the lasers involved in the excitation. As a result, the time dependences of the ionization probability, the populations in the bound states and the form of the photoelectron energy spectra can all be controlled by varying the phase difference of the lasers. We also show that for specific atomic and phase parameters population can be entirely trapped within a superposition state, totally immune to decay, with no ionization whatsoever.
The finite bandwidth of a short laser pulse often overlaps several initially unpopulated low-lying excited states of an atom. We show that when such a pulse is used to photoionize an atom, the low-lying levels may be pumped into a coherent superposition that inhibits or prevents excitation of the atom, effectively trapping population in the initial state of the atom. The existence of the effect was first noted in a numerical study of short-pulse excitation of hydrogen. Here we explore the effect through a series of simple models that demonstrate the physics of the effect in the simplest possible situations.
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