| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Dynamics of laser beams in inhomogeneous electron—positron—ion plasmas |
| Cheng Li-Hong (成丽红), Tang Rong-An (唐荣安), Du Hong-E (杜宏娥), Xue Ju-Kui (薛具奎) |
| Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China |
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Abstract Nonlinear interaction of laser and electron–positron–ion plasmas is investigated by invoking the variational principle and numerical simulation, in terms of a nonlinear Schrödinger equation with inhomogeneities effect. It is shown that the plasma inhomogeneity has great influence on the laser beam dynamics. The laser beam can be self-trapped, focused, or defocused depending on the inhomogeneity character. The linearly decreasing axial plasma density makes the laser beam defocus, while the linearly increasing axial plasma density results in self-trapping of the beam. The self-focusing of the trapped beam is found in a high-density region. For the Gaussian types of density distribution, the beam field submits nonlinearly oscillating regime. The results provide an efficient way to manipulate the dynamics of laser beam propagating in plasma.
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Received: 26 November 2014
Revised: 05 January 2015
Accepted manuscript online:
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PACS:
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52.27.Ep
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(Electron-positron plasmas)
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52.38.Hb
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(Self-focussing, channeling, and filamentation in plasmas)
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98.70.Rz
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(γ-ray sources; γ-ray bursts)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11274255 and 11305132), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20136203110001), the Natural Science Foundation of Gansu Province, China (Grant No. 2011GS04358), and the Creation of Science and Technology of Northwest Normal University, China (Grant Nos. NWNU-KJCXGC-03-48 and NWNU-LKQN-12-12). |
Corresponding Authors:
Xue Ju-Kui
E-mail: xuejk@nwnu.edu.cn
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Cite this article:
Cheng Li-Hong (成丽红), Tang Rong-An (唐荣安), Du Hong-E (杜宏娥), Xue Ju-Kui (薛具奎) Dynamics of laser beams in inhomogeneous electron—positron—ion plasmas 2015 Chin. Phys. B 24 075201
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