Open AccessTime-resolved studies of femtosecond-laser induced melt dynamics
Author(s) -
Claudia Unger,
Jürgen Koch,
Ludger Overmeyer,
Boris N. Chichkov
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.024864
Subject(s) - femtosecond , fluence , materials science , laser , optics , full width at half maximum , cavitation , irradiation , resolution (logic) , dynamics (music) , temporal resolution , optoelectronics , physics , artificial intelligence , computer science , mechanics , nuclear physics , acoustics
This work presents time-resolved images of femtosecond-laser-induced melt dynamics in 60 nm gold films on glass substrates. Melt dynamics induced by laser radiation with focus diameters of 6 μm and 8 μm (FWHM) at constant laser fluence is investigated with a temporal resolution of 10 ns. In both cases, the formation of the microbumps and gold jets takes at least 250 ns. It is shown that the formation process can be compared to jetting behavior induced by cavitation bubbles near a free liquid surface. This is confirmed by SEM illustrating a re-entrant spike through a hole in the microbump.