Open AccessThree-dimensional temperature distribution and modification mechanism in glass during ultrafast laser irradiation at high repetition rates
Author(s) -
Masahiro Shimizu,
Masaaki Sakakura,
Masatoshi Ohnishi,
Masahiro Yamaji,
Yasuhiko Shimotsuma,
Kazuyuki Hirao,
Kiyotaka Miura
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.000934
Subject(s) - materials science , laser , optics , irradiation , molar absorptivity , ultrashort pulse , attenuation coefficient , composite material , physics , nuclear physics
We experimentally determined the three-dimensional temperature distribution and modification mechanism in a soda-lime-silicate glass under irradiation of ultrafast laser pulses at high repetition rates by analyzing the relationship between the morphology of the modification and ambient temperature. In contrast to previous studies, we consider the temperature dependence of thermophysical properties and the nonlinear effect on the absorbed energy distribution along the beam propagation axis in carrying out analyses. The optical absorptivity evaluated with the temperature distribution is approximately 80% and at most 3.5% smaller than that evaluated by the transmission loss measurement. The temperature distribution and the strain distribution indicate that visco-elastic deformation and material flow play important roles in the laser-induced modification inside a glass.