The evolution of nonequilibrium laser plasma of metals with the formation of structures

Processes in a plasma formed by the evaporation of material by middle power laser radiation on a metallic surface are analyzed. In the regime considered the laser radiation is not absorbed by a metallic plasma and the radiation energy is spent in the main for the atomic evaporation. As a result of the plasma relaxation, hard metallic particles of sizes of the order of 10 nm are formed. They are joined in fractal aggregates of micron sizes, and fractal aggregates may be joined in aerogel-like structures of centimeters sizes. Such a laserplasma is an example of a plasma whose evolution leads to fractal object formation. A fireball is considered as a fractal object formed as a result of the evolution of an evaporated plasma. The considered object with aerogel-like structure that is formed in a gas has both scientific and practical interest.