Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan. m‐
Opt Lett. 2011 Jun 1;36(11):2161-3. doi: 10.1364/OL.36.002161.
We report on the formation mechanism of element distribution in glass under high-repetition-rate femtosecond laser irradiation. We simultaneously focused two beams of femtosecond laser pulses inside a glass and confirmed the formation of characteristically shaped element distributions. The results of the numerical simulation in which we considered concentration- and temperature-gradient-driven diffusions were in excellent qualitative agreement with the experimental results, indicating that the main driving force is the sharp temperature gradient. Since the composition of a glass affects its refractive index, absorption, and luminescence property, the results in this study provide a framework to fabricate a functional optical device such as optical circuits with a high-repetition-rate femtosecond laser.
我们报告了在高重复率飞秒激光辐照下玻璃中元素分布的形成机制。我们在玻璃内同时聚焦两束飞秒激光脉冲，并证实了特征形状的元素分布的形成。考虑浓度和温度梯度驱动扩散的数值模拟结果与实验结果非常吻合，表明主要驱动力是急剧的温度梯度。由于玻璃的成分会影响其折射率、吸收率和发光性能，因此本研究的结果为使用高重复率飞秒激光制造具有光学电路等功能的光学器件提供了一个框架。
