학술논문
Population inversion in a strongly driven two-level system at far-off resonance.
Document Type
Article
Author
Source
Subject
*POPULATION inversion
*FLOQUET theory
*QUANTUM mechanics
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Language
ISSN
0953-4075
Abstract
The population transfer dynamics in a strongly driven two-level system is studied. It is shown that population inversion can be efficiently achieved when a laser pulse whose photon energy is about half of the energy separation of the two levels is turned on suddenly. This situation is realized when a neutral atom or molecule is ionized at the peak of the laser field, followed by the laser-driven population transfer among two states of an atomic or molecular ion. The mechanism of the efficient population transfer for an ion effectively exposed to a laser field with a sudden turn-on is examined by numerical calculations based on the quasi-stationary Floquet theory. [ABSTRACT FROM AUTHOR]