Structural modifications of binary lithium silicate glasses upon femtosecond laser pulse irradiation probed by micro-Raman spectroscopy

The effects of single femtosecond laser pulse irradiation (130 fs pulse duration, 800 nm center wavelength) on the structure of binary lithium silicate glasses of varying chemical compositions were investigated by micro-Raman spectroscopy. Permanent modifications were generated at the surface of the glass samples with varying laser fluences in the ablative regime and evaluated for changes in the corresponding Raman band positions and bandwidths. For increasing laser fluences, the position of certain Raman bands changed, indicating an increase in the mass density of the glass inside the irradiated area. Simultaneously, the widths of all investigated bands increased, indicating a higher degree of disorder in the glass structure with respect to bond-angle and bond-length variations.

利用显微拉曼光谱研究了单飞秒激光脉冲（脉冲持续时间为130飞秒，中心波长为800纳米）辐照对不同化学成分的二元硅酸锂玻璃结构的影响。在烧蚀区域内，以不同的激光能量密度在玻璃样品表面产生了永久性的改性，并对相应拉曼谱带位置和带宽的变化进行了评估。随着激光能量密度的增加，某些拉曼谱带的位置发生了变化，这表明辐照区域内玻璃的质量密度增加。同时，所有被研究谱带的宽度都增加了，这表明相对于键角和键长的变化，玻璃结构的无序程度更高。