V. S. Belyaev, D. V. Kovkov, A. P. Matafonov, G. F. Karabadzhak, G. G. Raikunov, A. Ya. Faenov, S. A. Pikuz, I. Yu. Skobelev, T. A. Pikuz, D. A. Fokin, G. N. Ignat'ev, S. V. Kapitanov, P. S. Krapiva, K. E. Korotkov, V. E. Fortov, “Temporal structure of X-ray radiation pulses of picosecond laser plasma”, Kvantovaya Elektronika, 2013, Volume 43, Number 9,Pages <nobr>865

Effect of laser light on matter. Laser plasmas

Temporal structure of X-ray radiation pulses of picosecond laser plasma

V. S. Belyaev^a, D. V. Kovkov^a, A. P. Matafonov^a, G. F. Karabadzhak^a, G. G. Raikunov^a, A. Ya. Faenov^b, S. A. Pikuz^b, I. Yu. Skobelev^b, T. A. Pikuz^b, D. A. Fokin^b, G. N. Ignat'ev^c, S. V. Kapitanov^c, P. S. Krapiva^c, K. E. Korotkov^c, V. E. Fortov^b

^a The Central Research Institute of Machinery, Korolev, Moscow region
^b Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow
^c All-Russian Scientific Research Institute of Automatics, Moscow

Abstract: The shape of the X-ray pulse generated by picosecond laser plasma is experimentally studied. The unusual phenomenon was experimentally observed for the first time for targets made of moderate-heavy chemical elements, namely, the pulse of hard X-ray radiation generated by laser plasma at the laser radiation flux of ~10¹⁸ W cm^-2 had a longer duration than the pulse of softer X-ray radiation. A simple kinetic model is suggested for explaining this fact. We have suggested a method for controlling the temporal shape of X-ray pulse emitted by laser plasma by varying the contrast of laser pulse.

Keywords: laser plasma, X-ray radiation, picosecond pulses.

PACS: 52.50.Jm, 52.38.Ph

Received: 04.03.2013
Revised: 28.05.2013