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ID 55644
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Yoshimura, Motohiko Center of Quantum Universe, Faculty of Science, Okayama University
Sasao, N. Research Core for Extreme Quantum World, Okayama University
Tanaka, M. Department of Physics, Graduate School of Science, Osaka University
Abstract
We develop for dipole-forbidden transition a dynamical theory of two-photon paired superradiance (PSR). This is a cooperative process characterized by two photons emitted back to back with equal energies. By irradiating the trigger laser from two target ends, with its frequency tuned at the half energy between two levels, a macroscopically coherent state of medium and fields dynamically emerges as time evolves, and a large signal of amplified output occurs with a time delay. The basic semiclassical equations in 1 + 1 space-time dimensions are derived for the field-plus-medium system to describe the space-time evolution of the entire system and are numerically solved to demonstrate the existence of both explosive and weak PSR phenomena in the presence of relaxation terms. The explosive PSR event terminates accompanying a sudden release of most of the energy stored in the target. Our numerical simulations are performed using the vibrational transition X-1 Sigma(+)(g)upsilon = 1 -> 0 of a para-H-2 molecule and taking many different excited atom number densities and different initial coherences between the metastable and the ground states. In an example with a number density close to O(10(21) cm(-3)) and a high initial coherence, the explosive event terminates several nanoseconds after the trigger irradiation, when the phase relaxation time larger than O(10 ns) is taken. After PSR events the system is expected to follow a steady-state solution which is obtained by analytic means and is made of many objects of field condensates endowed with a topological stability.
Note
This is an article published by American Physical Society
Published Date
2012-07
Publication Title
Physical Review A
Volume
volume86
Issue
issue1
Publisher
American Physical Society
Start Page
013812
ISSN
1050-2947
NCID
AA10764867
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
American Physical Society
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DOI
Web of Sience KeyUT
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isVersionOf https://doi.org/10.1103/PhysRevA.86.013812