Heating and rapid cooling of bulk glass after photoexcitation by a focused femtosecond laser pulse.
Heating and rapid cooling of bulk glass after photoexcitation by a focused femtosecond laser pulse.
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DOI：
10.1364/oe.15.016800
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发表时间：
2007-12
期刊：
影响因子：
3.8
通讯作者：
M. Sakakura;Masahide Terazima;Y. Shimotsuma;K. Miura;K. Hirao
中科院分区：
文献类型：
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作者：
M. Sakakura;Masahide Terazima;Y. Shimotsuma;K. Miura;K. Hirao
为了研究飞秒激光脉冲在锌硼硅酸盐玻璃中聚焦后的能量耗散过程，采用瞬态透镜（TrL）方法观察了激光聚焦区的时间相关透镜效应.我们发现，100 ns后的TrL信号可以清楚地解释热扩散。通过对观测信号的拟合，我们得到了由于温度升高而引起的相变、加热体积的初始直径和热扩散率。在此基础上，估算了温度的增加和冷却速率分别约为1800 K和1.7 × 10（8）Ks（-1）。我们还观察到了100 ns尺度上的信号变化，这不能用热扩散模型来解释。这种变化归因于加热材料的松弛。
To investigate the energy dissipation process after focusing a femtosecond laser pulse inside a zinc borosilicate glass, the time-dependent lens effect in the laser focal region was observed by a transient lens (TrL) method. We found that the TrL signal after 100 ns can be explained clearly by thermal diffusion. By fitting the observed signal, we obtained the phase change due to temperature increase, the initial diameter of the heated volume and the thermal diffusivity. On the basis of the results, the temperature increase and the cooling rate were estimated to be about 1800 K and 1.7X10(8) Ks(-1), respectively. We have also observed the signal change on a 100 ns scale, which can not be explained by the thermal diffusion model. This change was attributed to the relaxation of the heated material.