Abstract
Abstract The focused beam of a KrF laser (248 nm) has been applied to irradiate targets of Al 2 O 3 , SiC, graphite, Pb, Ni, Cr, quartz, and NaCl at variable laser energy flux is the range 0–13 J/cm 2 . The amount of target material ejected into the vacuum (background pressure about 8 × 10 −4 Torr) was determined from the target weight before and after laser irradiation. The average number of particles (formula weight) evaporated per laser pulse and per unit of irradiated target area is non-linearly dependent on the laser energy flux. The evaporation of Al 2 O 3 , SiC, and graphite is showing a well-defined flux threshold while the vaporization of Pb, Ni and Cr is rising smoothly with increasing flux. With both groups of materials laser evaporation is monotonically increasing with the laser energy flux. NaCl and quartz, on the other hand, are showing an intermediate maximum in the laser vaporization efficiency.
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