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ID 55644
フルテキストURL
著者
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
抄録
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.
備考
This is an article published by American Physical Society
発行日
2012-07
出版物タイトル
Physical Review A
86巻
1号
出版者
American Physical Society
開始ページ
013812
ISSN
1050-2947
NCID
AA10764867
資料タイプ
学術雑誌論文
言語
English
OAI-PMH Set
岡山大学
著作権者
American Physical Society
論文のバージョン
publisher
DOI
Web of Sience KeyUT
関連URL
isVersionOf https://doi.org/10.1103/PhysRevA.86.013812