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Hur, Min Sup
Computational Plasma Lab
Research Interests
  • Laser-Plasma Electron Accelerator and Table-top Femto Hard X-ray generation
  • Plasma-based THz generation
  • PIC and fluid code development
  • Reduced Laser-Plasma modelling
  • Capillary Discharge Systems for Guidied Laser Wakefield Accelerators

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Plasma density ramp for relativistic self-focusing of an intense laser

Cited 27 times inthomson ciCited 26 times inthomson ci
Title
Plasma density ramp for relativistic self-focusing of an intense laser
Author
Gupta, Devki N.Hur, Min SupHwang, IlmoonSuk, HyyongSharma, Ashok K.
Keywords
Defocusing; Plasma density ramp; Self-focusing
Issue Date
2007-05
Publisher
OPTICAL SOC AMER
Citation
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, v.24, no.5, pp.1155 - 1159
Abstract
It is known that a high-power laser propagating through an underdense plasma can acquire a minimum spot size due to relativistic self-focusing. Beyond the focus, the nonlinear refraction starts weakening, and the spot size of the laser increases, showing periodic self-focusing/defocusing behavior with the distance of propagation. To overcome the defocusing, we propose the introduction of a localized upward plasma density ramp. In the presence of an upward ramp of plasma density, the laser beam obtains a minimum spot size and maintains it with only a mild ripple. For suitable parameters of the laser and the plasma, we have deduced conditions for the self-focusing. This kind of plasma density ramp may be observed in a gas-jet plasma experiment and resembles a plasma lens.
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DOI
10.1364/JOSAB.24.001155
ISSN
0740-3224
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PHY_Journal Papers
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