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Träfflista för sökning "WFRF:(Vysin L.) srt2:(2009)"

Sökning: WFRF:(Vysin L.) > (2009)

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1.
  • Chalupsky, J, et al. (författare)
  • Non-thermal desorption/ablation of molecular solids induced by ultra-short soft x-ray pulses
  • 2009
  • Ingår i: Optics Express. - 1094-4087. ; 17:1, s. 208-217
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the first observation of single-shot soft x-ray laser induced desorption occurring below the ablation threshold in a thin layer of poly ( methyl methacrylate) - PMMA. Irradiated by the focused beam from the Free-electron LASer in Hamburg ( FLASH) at 21.7nm, the samples have been investigated by atomic-force microscope (AFM) enabling the visualization of mild surface modifications caused by the desorption. A model describing non-thermal desorption and ablation has been developed and used to analyze single-shot imprints in PMMA. An intermediate regime of materials removal has been found, confirming model predictions. We also report below-threshold multiple-shot desorption of PMMA induced by high-order harmonics (HOH) at 32nm. Short-time exposure imprints provide sufficient information about transverse beam profile in HOH's tight focus whereas long-time exposed PMMA exhibits radiation-initiated surface hardening making the beam profile measurement infeasible. (C) 2008 Optical Society of America
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2.
  • Nelson, A. J., et al. (författare)
  • Soft x-ray free electron laser microfocus for exploring matter under extreme conditions
  • 2009
  • Ingår i: Optics Express. - 1094-4087. ; 17:20, s. 18271-18278
  • Tidskriftsartikel (refereegranskat)abstract
    • We have focused a beam (BL3) of FLASH (Free-electron LASer in Hamburg: lambda = 13.5 nm, pulse length 15 fs, pulse energy 10-40 mu J, 5Hz) using a fine polished off-axis parabola having a focal length of 270 mm and coated with a Mo/Si multilayer with an initial reflectivity of 67% at 13.5 nm. The OAP was mounted and aligned with a picomotor controlled six-axis gimbal. Beam imprints on poly(methyl methacrylate) -PMMA were used to measure focus and the focused beam was used to create isochoric heating of various slab targets. Results show the focal spot has a diameter of <= 1 mu m. Observations were correlated with simulations of best focus to provide further relevant information.
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