High-intensity laser-driven proton acceleration: influence of pulse contrast

P McKenna, Filip Lindau, Olle Lundh, D Neely, Anders Persson, Claes-Göran Wahlström

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Abstract

Proton acceleration from the interaction of ultra-short laser pulses with thin foil targets at intensities greater than 10(18) W cm(-2) is discussed. An overview of the physical processes giving rise to the generation of protons with multi-MeV energies, in well defined beams with excellent spatial quality, is presented. Specifically, the discussion centres on the influence of laser pulse contrast on the spatial and energy distributions of accelerated proton beams. Results from an ongoing experimental investigation of proton acceleration using the 10 Hz multi-terawatt Ti : sapphire laser (35 fs, 35 TW) at the Lund Laser Centre are discussed. It is demonstrated that a window of amplified spontaneous emission (ASE) conditions exist, for which the direction of proton emission is sensitive to the ASE-pedestal preceding the peak of the laser pulse, and that by significantly improving the temporal contrast, using plasma mirrors, efficient proton acceleration is observed from target foils with thickness less than 50 nm.
Original languageEnglish
Pages (from-to)711-723
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Science
Volume364
Issue number1840
DOIs
Publication statusPublished - 2006

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Keywords

  • laser-plasma interactions
  • laser-particle acceleration
  • proton beam

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