Article

Applied Physics A

, Volume 96, Issue 1, pp 23-31

Modelling and optimisation of fs laser-produced K α sources

  • P. GibbonAffiliated withJülich Supercomputing Centre, Institute for Advanced Computing, Forschungszentrum Jülich Email author 
  • , M. MašekAffiliated withJülich Supercomputing Centre, Institute for Advanced Computing, Forschungszentrum JülichInstitute of Physics, Academy of Sciences of the Czech Republic
  • , U. TeubnerAffiliated withFachbereich Technik–Naturwissenschaftliche Technik–Bereich Photonik, Fachhochschule Oldenburg/Ostfriesland/Wilhelmshaven, University of Applied SciencesInstitut für Physik, Carl von Ossietzky Universität Oldenburg
  • , W. LuAffiliated withInstitut für Experimentelle Physik, Universität Duisburg-Essen
  • , M. NicoulAffiliated withInstitut für Experimentelle Physik, Universität Duisburg-Essen
  • , U. ShymanovichAffiliated withInstitut für Experimentelle Physik, Universität Duisburg-Essen
  • , A. TarasevitchAffiliated withInstitut für Experimentelle Physik, Universität Duisburg-Essen
  • , P. ZhouAffiliated withInstitut für Experimentelle Physik, Universität Duisburg-Essen
  • , K. Sokolowski-TintenAffiliated withInstitut für Experimentelle Physik, Universität Duisburg-Essen
    • , D. von der LindeAffiliated withInstitut für Experimentelle Physik, Universität Duisburg-Essen

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Abstract

Recent theoretical and numerical studies of laser-driven femtosecond K α sources are presented, aimed at understanding a recent experimental campaign to optimize emission from thin coating targets. Particular attention is given to control over the laser–plasma interaction conditions defined by the interplay between a controlled prepulse and the angle of incidence. It is found that the x-ray efficiency for poor-contrast laser systems in which a large preplasma is suspected can be enhanced by using a near-normal incidence geometry even at high laser intensities. With high laser contrast, similar efficiencies can be achieved by going to larger incidence angles, but only at the expense of larger x-ray spot size. New developments in three-dimensional modelling are also reported with the goal of handling interactions with geometrically complex targets and finite resistivity.

PACS

52.38.-r 52.38.Ph 52.65.-y