engleski

Laser action on magnesium and aluminium targets

The beam of a ruby laser was focused onto two targets, 12Mg and 13Al, the irradiance being 140 GW/cm2. In both cases similar processes developed. Time resolved spectra in the region 9-23 nm showed highly ionized atoms. The electron temperature (about 50 eV) and the ion velocities (about 106 cm/s) were investigated. Due to plasma explosion, deep craters with radial jetting are shown on the target surfaces. Ripples around the craters are explained by spreading of sound waves, laterally deposited plasmas were mixed with expanding target particles.

Ruby laser irradiation; Aluminium and magnesium targets; Time resolved spectra; Plasma characteristics; Craters and ripples formations.

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