Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Physics B Atomic Molecular and Optical Physics

Population trapping in laser-induced continuum-continuum transitions

Kazimierz Rza̧żewski, Joseph W. Haus, L Wang

Published Oct 28, 1989• 2 citations
Publisher

Abstract

The authors show that the population trapping phenomenon found by Deng and Eberly (1986, 1988) for free-free transitions between structureless continua occurs under much more general conditions. They solve the time-dependent models exactly and show for asymptotically long times that population trapping can occur for two continua with energy-dependent matrix elements, and for an infinite number of structureless continua with coupled bands. Furthermore, they show that the trapping persists for two continua coupled by a noisy laser. The amount of trapping depends on the initial conditions.

DOI
10.1088/0953-4075/22/20/010

Related papers

Continuum-continuum population trapping

Ronald S. Burkey, C. A. Glosson, Cyrus D. Cantrell

We consider the problem of coherent population trapping in a model quantum system consisting of two (and briefly three) coupled continua of energy levels. While an earlier study [Z. Deng and J. H. Eberly, Phys. Rev. A 34, 2492 (1986)] has demonstrated population trapping in a closely related system, it has done so only for the case of a broad featureless continuum. We will demonstrate, on the other hand, that the time evolution of the continuum is qualitatively very different when different types of continua are allowed, and that population trapping is not likely to occur except in the broad featureless continuum. We do show, however, that in some cases other counterintuitive results surface.

Physical Review A•Mar 1, 1989•4 citations

Coherent trapping in continuum-continuum transitions

Zhifang Deng, Joseph H. Eberly

We study a quantum model in which transitions occur between structureless continua. The population is in one of the continua initially. When the continuum-continuum coupling is very strong, we show that the continua are decoupled and population trapping occurs.

Physical Review A•Sep 1, 1986•16 citations

Comment on ‘‘Coherent trapping in continuum-continuum transitions’’

E. Arimondo, N. K. Rahman

We discuss the theory of Z. Deng and J. H. Eberly [Phys. Rev. A 34, 2492 (1986)] and present our point of view regarding coherent trapping and continua, which is not in agreement with that put forward by these authors.

Physical Review A•Apr 1, 1988•5 citations

Population trapping in continuum-continuum transitions

Zofia Białynicka-Birula

An exactly soluble model is used to describe transitions, induced by two strong laser beams, proceeding from the initial discrete state to the continuum via two channels. In the first channel the transition occurs via an intermediate, near-resonant discrete state located close to the continuum edge. In the second channel the intermediate state belongs to the continuum. Population trapping occurs due to an interference between the two channels. The model can be used to describe the photodetachment of electrons from negative ions or the photodissociation of molecules.

Journal of Physics B Atomic and Molecular Physics•Dec 14, 1983•13 citations

Coherent population trapping in multilevel laser-induced continuum structure system including cascade two-photon processes

Gao‐xiang Li, Huang Guang-ming, PENG JIN-SHENG

We have investigated the atomic coherent population trapping in a multilevel laser-induced continuum structure system including cascade two-photon processes, in which two sets of quasicontinua of excited levels to be modeled as the Bixon-Jortner quasicontinuum are laser-embedded into a previously structureless atomic continuum. The condition leading to the atomic coherent population trapping and the coherent population trapping state are given explicitly. And the effects of the Fano factors, the laser intensities and the detunings on the amount of population trapped in the atomic bound states and the populations distributed in the two sets of quasicontinua are also examined.

Acta Physica Sinica (Overseas Edition)•Jun 1, 1998•3 citations

Time-dependent pulse and frequency behavior of population trapping via the continuum

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

Summary form only given. We study two fundamental systems that involve continua: a system with a single autoionizing state and the laser induced continuum structure scheme (LICS), both shown. We pay special attention to the response of these systems to time-dependent pulse interactions, which we find to differ from that of square pulse interactions. Such a study is particularly useful from the point of view of the many applications associated with these systems. For the theoretical analysis we perform appropriate transformations that allow us to study both systems simultaneously. From an analysis of the resulting Hamiltonian of these systems, we determine the important conditions for efficient population trapping.

Conference on Lasers and Electro-Optics•Nov 27, 2002•0 citations
The authors show that the population trapping phenomenon found by Deng and Eberly (1986, 1988) for free-free transitions between structureless continua occurs under much more general conditions. They solve the time-dependent models exactly and show for asymptotically long times that population trapping can occur for two continua with energy-dependent matrix elements, and for an infinite number of structureless continua with coupled bands. Furthermore, they show that the trapping persists for two continua coupled by a noisy laser. The amount of trapping depends on the initial conditions.
We consider the problem of coherent population trapping in a model quantum system consisting of two (and briefly three) coupled continua of energy levels. While an earlier study [Z. Deng and J. H. Eberly, Phys. Rev. A 34, 2492 (1986)] has demonstrated population trapping in a closely related system, it has done so only for the case of a broad featureless continuum. We will demonstrate, on the other hand, that the time evolution of the continuum is qualitatively very different when different types of continua are allowed, and that population trapping is not likely to occur except in the broad featureless continuum. We do show, however, that in some cases other counterintuitive results surface.
An exactly soluble model is used to describe transitions, induced by two strong laser beams, proceeding from the initial discrete state to the continuum via two channels. In the first channel the transition occurs via an intermediate, near-resonant discrete state located close to the continuum edge. In the second channel the intermediate state belongs to the continuum. Population trapping occurs due to an interference between the two channels. The model can be used to describe the photodetachment of electrons from negative ions or the photodissociation of molecules.
We have investigated the atomic coherent population trapping in a multilevel laser-induced continuum structure system including cascade two-photon processes, in which two sets of quasicontinua of excited levels to be modeled as the Bixon-Jortner quasicontinuum are laser-embedded into a previously structureless atomic continuum. The condition leading to the atomic coherent population trapping and the coherent population trapping state are given explicitly. And the effects of the Fano factors, the laser intensities and the detunings on the amount of population trapped in the atomic bound states and the populations distributed in the two sets of quasicontinua are also examined.
Summary form only given. We study two fundamental systems that involve continua: a system with a single autoionizing state and the laser induced continuum structure scheme (LICS), both shown. We pay special attention to the response of these systems to time-dependent pulse interactions, which we find to differ from that of square pulse interactions. Such a study is particularly useful from the point of view of the many applications associated with these systems. For the theoretical analysis we perform appropriate transformations that allow us to study both systems simultaneously. From an analysis of the resulting Hamiltonian of these systems, we determine the important conditions for efficient population trapping.