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Träfflista för sökning "L773:0263 0346 srt2:(2005-2009)"

Sökning: L773:0263 0346 > (2005-2009)

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1.
  • McKenna, P., et al. (författare)
  • Effects of front surface plasma expansion on proton acceleration in ultraintense laser irradiation of foil targets
  • 2008
  • Ingår i: Laser and Particle Beams. - 0263-0346. ; 26:4, s. 591-596
  • Tidskriftsartikel (refereegranskat)abstract
    • The properties of beams of high energy protons accelerated during ultraintense, picosecond laser-irradiation of thin foil targets are investigated as a function of preplasma expansion at the target front surface. Significant enhancement in the maximum proton energy and laser-to-proton energy conversion efficiency is observed at optimum preplasma density gradients due, to self-focusing Of the incident laser pulse. For very long preplasma expansion, the propagating laser pulse is observed to filament, resulting in highly uniform proton beams, but with reduced flux and maximum energy.
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2.
  • Osvay, Karoly, et al. (författare)
  • On the temporal contrast of high intensity femtosecond laser pulses
  • 2005
  • Ingår i: Laser and Particle Beams. - 0263-0346. ; 23:3, s. 327-332
  • Tidskriftsartikel (refereegranskat)abstract
    • The temporal contrast is classified into two main regimes, the nanosecond-scale and the picosecond-scale contrast prior to the main pulse. The Lund terawatt laser system is shown to be improved on the nano- and picosecond-scale by a factor of 10 and 50, respectively, when it was optimized for contrast but not for energy. Calculations are also presented to emphasize the role of angular dispersion on the picosecond contrast. Finally we show a compromise between the duration and contrast of femtosecond laser pulses amplified in an optical parametric (chirped pulse) amplifier.
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