Propagation of intense subpicosecond laser pulses through underdense plasmas

摘要: The propagation of an intense, subpicosecond laser pulse through a substantial length $(L/\ensuremath{\lambda}\ensuremath{\sim}{10}^{3})$ underdense plasma $({n/n}_{c}\ensuremath{\sim}1%)$ is studied experiments and computer simulations. For $I\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}8\ifmmode\times\else\texttimes\fi{}{10}^{17}$ W/c${\mathrm{m}}^{2}$ only 55% the incident light was transmitted within focal cone angle. decrease in transmission accompanied by Raman forward scattering as evidenced generation anti-Stokes sidebands up to 2 MeV electrons. Simulations show that majority reduction could be due side scattering.