Experimental investigation of the interaction of rhodamine 6G laser radiation with aluminum

The interaction of laser radiation ($\lambda=0,58\mu m$) pulses of $\thickapprox10\mu s$ duration with aluminum was investigated in the range of radiation power densities $q=5-60$ MW/cm${}^2$. The optical characteristics and the spatial and temporal temperature distributions along the axial region of a jet were determined. Measurements were made of the velocity of the leading edge of the jet and of the energy deposited in the target before the appearance of a burst of absorption. It was demonstrated that, in the range of $q$ investigated and for an irradiation of an area $\thicksim0,1$ cm${}^2$, the interaction with the aluminum resulted in evaporation, although for values of $g\geqslant10$ МВт/см${}^2$ the lines of ionized air were present in the emission spectra of the leading edge of the jet.