Shimizu Masahiro, Sakakura Masaaki, Ohnishi Masatoshi, Yamaji Masahiro, Shimotsuma Yasuhiko, Hirao Kazuyuki, Miura Kiyotaka
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
Opt Express. 2012 Jan 16;20(2):934-40. doi: 10.1364/OE.20.000934.
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.
我们通过分析改性形态与环境温度之间的关系，实验测定了在高重复频率超快激光脉冲照射下钠钙硅酸盐玻璃中的三维温度分布和改性机理。与以往的研究不同，我们在进行分析时考虑了热物理性质的温度依赖性以及沿光束传播轴对吸收能量分布的非线性影响。根据温度分布评估的光吸收率约为80%，比通过传输损耗测量评估的光吸收率最多小3.5%。温度分布和应变分布表明，粘弹性变形和材料流动在玻璃内部的激光诱导改性中起重要作用。
