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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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Chirped pulse Raman amplification in warm plasma: towards controlling saturation

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Title
Chirped pulse Raman amplification in warm plasma: towards controlling saturation
Author
Yang, XuVieux, GregoryBrunetti, EErsfeld, BernhardFarmer, John PHur, Min SupIsaac, RCRaj, GauravWiggins, SMWelsh, GHYoffe, Sam RJaroszynski, Dino A
Issue Date
2015-08
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.5, pp.13333
Abstract
Stimulated Raman backscattering in plasma is potentially an efficient method of amplifying laser pulses to reach exawatt powers because plasma is fully broken down and withstands extremely high electric fields. Plasma also has unique nonlinear optical properties that allow simultaneous compression of optical pulses to ultra-short durations. However, current measured efficiencies are limited to several percent. Here we investigate Raman amplification of short duration seed pulses with different chirp rates using a chirped pump pulse in a preformed plasma waveguide. We identify electron trapping and wavebreaking as the main saturation mechanisms, which lead to spectral broadening and gain saturation when the seed reaches several millijoules for durations of 10's - 100's fs for 250 ps, 800 nm chirped pump pulses. We show that this prevents access to the nonlinear regime and limits the efficiency, and interpret the experimental results using slowly-varying-amplitude, current-averaged particle-in-cell simulations. We also propose methods for achieving higher efficiencies.
URI
https://scholarworks.unist.ac.kr/handle/201301/18124
URL
http://www.nature.com/articles/srep13333
DOI
10.1038/srep13333
ISSN
2045-2322
Appears in Collections:
PHY_Journal Papers
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