Control of element distribution in glass with femtosecond laser
Control of element distribution in glass with femtosecond laser
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DOI：
10.1117/12.906644
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
M. Shimizu;M. Sakakura;M. Nishi;Y. Shimotsuma;K. Hirao;K. Miura
中科院分区：
文献类型：
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作者：
M. Shimizu;M. Sakakura;M. Nishi;Y. Shimotsuma;K. Hirao;K. Miura
多组分玻璃中的元素迁移是由高重复频率飞秒激光照射引起的现象，并且使得能够对玻璃组成进行空间选择性修改。由于玻璃的组成影响其材料性质，例如折射率、发光、蚀刻速率、粘度、结晶温度和相分离性质，因此元素迁移对于实际应用具有极大的兴趣。然而，迁移的机制尚未阐明。在这项研究中，我们成功地确定了它的驱动力。在一项实验研究中，我们同时将两束飞秒激光脉冲聚焦到硅酸盐玻璃内的两个空间分离的光斑中。我们观察到形成的特征形状的元素分布的电子探针显微分析。此外，我们进行了数值模拟，我们认为浓度和温度梯度驱动的扩散。模拟结果与实验结果定性一致，表明元素迁移可以用热扩散解释，驱动力是温度梯度。这些结果构成了玻璃性能的三维控制的重要进展。
Element migration in multicomponent glass is a phenomenon induced by high-repetition femtosecond laser irradiation and enables spatially selective modification of glass composition. Since the composition of a glass affects its material properties such as refractive index, luminescence, etching rate, viscosity, crystallization temperature, and phase-separation property, element migration is of great interest for practical applications. However, the mechanisms underlying migration have not been elucidated. In this study, we succeeded in identifying its driving force. In an experimental study, we simultaneously focused two beams of femtosecond laser pulses into two spatially-separated spots inside silicate glass. We observed the formation of characteristically shaped element distributions by electron probe microanalysis. In addition, we performed numerical simulations in which we considered concentration- and temperature-gradient-driven diffusions. The simulation results were in excellent qualitative agreement with the experimental results, indicating that element migration can be explained by thermodiffusion and that the driving force is the temperature gradient. These results constitute an important advance for three-dimensional control of glass properties.