In this work, results on a new laser-induced mechanism of microstructures formation on the surface of borosilicate glass are presented. The samples are fabricated by melt quenching method and consist of 50% SiO2, 20% Al2O3, 20% B2O3, 5% CaO, 2% Li2O, 3% MgO (in wt.%). Irradiation at 266 nm delivered by Nd:YAG nanosecond system is used to modify the glass surface. It is found that this processing may result in the formation of voids in the irradiated area that have submicron mean diameter. The effect is observed at fluences below the ablation threshold. Different laser fluences and pulse number are applied to estimate their role on the induced surface morphology. It is observed that voids are also observed in the remaining material after ablation of the irradiated zone at high fluences. In this regime, glass structure modifications can also be observed under the glass surface at depths that may reach 100 µm. Based on measurements by differential thermal analysis equipped by mass spectrometer is concluded that the void formation is related to emission of gas phase from the glass induced by the laser heating.

中文翻译：

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纳秒激光脉冲诱导玻璃结构的气体喷射机制

在这项工作中，提出了一种新的激光诱导硼硅酸盐玻璃表面微结构形成机制的结果。样品采用熔体淬火法制造，由 50% SiO2、20% Al2O3、20% B2O3、5% CaO、2% Li2O、3% MgO（重量百分比）组成。Nd:YAG 纳秒系统提供的 266 nm 辐射用于修饰玻璃表面。发现这种处理可能导致在辐照区域中形成具有亚微米平均直径的空隙。在低于消融阈值的通量处观察到该效果。应用不同的激光能量密度和脉冲数来估计它们对诱导表面形态的作用。观察到在高通量烧蚀照射区后，在剩余材料中也观察到空隙。在这个制度下，玻璃结构的改变也可以在玻璃表面下观察到，深度可达 100 µm。基于配备质谱仪的差热分析测量得出的结论是，空隙的形成与激光加热引起的玻璃气相发射有关。