THE INTERACTION OF HIGH DENSITY SHORT PULSE LASER WITH MATTER

摘要

The study of the interaction of High Density Short Pulse (HDSP) lasers withmatter is an important rapidly expanding branch of Physics. Since 1985 theselasers have been developed to generate very short pulses with typical highperformance parameters: peak powers up to hundreds of TW, pulse duration lessthan 20 fs, pulse energy more than 2J, repetition rate up to 10 Hz and wavelengthof 800nm that could be lowered through higher harmonic generation. When suchphotons are properly focused on a target, creation of simultaneous unprecedentedconditions in the laboratories within very short time takes place, namely:brightness up to 10~(20)W/cm~2, electric fields up to 10~(11) V/cm, magnetic fields upto 10~9gauss, temperatures of the order 10~(12)°K, pressures -10~9bars andacceleration of up to 10~(26)cm/s~2. These conditions could definitely initiate severenonlinearities within the exposed materials. The main objective of this paper is to review the studies on particle generation, particularly neutrons, by theinteraction of high intensity lasers with solid or gas targets. Then propose theirpossible applications.