Laser plasma limiting effects at nanosecond laser microablation

摘要

Abstract: Plasma plume expansion and crater formation in the interaction of Nd-YAG laser beam (TEM$-oo$/-mode, 532 nm, 6 ns pulse duration and 10 $mu@m waist at FWHM) with various metal targets in air were investigated. The craters formed at the surfaces were measured with 0.1 $mu@m longitudinal and 0.5 $mu@m transversal resolutions. Laser plasma expansion during laser pulse/surface interaction was measured by ICCD camera with 3 $mu@m spatial and 1 ns temporal resolutions. These measurements were performed with different optical filters in the following spectral ranges (250$LS $lambda $LS@400 nm, 300$LS$lambda$LS@600 nm, 600$LS $lambda $LS@800 nm).!17