1. Institute of Electron Technology, al. Lotników 32/46, 02-668 Warsaw, Poland
2. Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
3. Departments of Electrical and Computer Engineering and Physics and Astronomy, Materials Science Program and Laboratory for Laser Energetics, University of Rochester, Rochester, NY-14627-0231, USA