Zhang Fangteng, Xie Xuhuan, Zhao Xinjie, Ma Lin, Lei Liang, Qiu Jianrong, Nie Zhaogang
Opt Express. 2021 Mar 29;29(7):10265-10274. doi: 10.1364/OE.420595.
Manipulation of femtosecond laser induced microstructures in glass by tuning the laser polarization has great potential in optics. Here we report two different polarization-dependent microstructures and their evolution with pulse repetition rate in an aluminosilicate glass induced by femtosecond laser irradiation. A V-shaped crack oriented parallel to the laser polarization plane is induced at the bottom of modified regions by pulses operated at 200 kHz, 1030 nm, and 300 fs. Further increasing the pulse repetition rate to 500 kHz leads to the formation of a dumbbell-shaped structure, which is elongated perpendicularly to the laser polarization, at the top of the modified region. The size of the coloration area and the dumbbell-shaped structure can be controlled by tuning the pulse duration. Further investigation indicates that higher numerical apertures are in favor of the presence of the polarization effects in femtosecond laser irradiation. The possible mechanism responsible for the formation of the two microstructures is discussed. These results could be helpful for understanding of ultrafast laser interaction with glass.
通过调整激光偏振来操控飞秒激光在玻璃中诱导产生的微结构在光学领域具有巨大潜力。在此，我们报道了飞秒激光辐照铝硅酸盐玻璃时两种不同的偏振相关微结构及其随脉冲重复率的演化情况。在200千赫兹、1030纳米波长和300飞秒的脉冲作用下，在改性区域底部诱导出一条平行于激光偏振平面的V形裂纹。将脉冲重复率进一步提高到500千赫兹会导致在改性区域顶部形成一个垂直于激光偏振方向拉长的哑铃形结构。通过调整脉冲持续时间可以控制着色区域和哑铃形结构的尺寸。进一步研究表明，更高的数值孔径有利于在飞秒激光辐照中出现偏振效应。讨论了这两种微结构形成的可能机制。这些结果有助于理解超快激光与玻璃的相互作用。
