Measurements of the plasma temperature associated with the interactions of high power pulse lasers with the materials

Investigations of the plasma parameters associated with plasma production by laser radiation of very high intensity are examined. In the experiment, 50 nsec, 5J Nd-glass laser pulses were focused onto plane targets of solid steel, aluminum, etc. Expansion speed and size measurement of the plasma were performed. The electron temperature of the plasma were determined from the absorption measurements through the plasma, the continuum radiation measurement, and the direct measurement of the radiation power in a finite frequency range. Building up and decay of the plasma density were determined by interferometric techniques