A series of Ge_11.5Sb_xSe_88.5–x (x = 5, 10, 15, 20, 25, 30) chalcogenide glasses were fabricated aiming at investigating the role of structure and water peak absorption in determining femtosecond laser ablation thresholds (F_th). The results indicate that the optical band gap decreases and that the Vickers hardness increases with increasing Sb content. Meanwhile, Raman spectra were measured before the femtosecond laser ablation experiment, suggesting a rise in average bond energy in the six glass samples with increasing Sb concentration. Ablation of the sample disks in air were performed with high repetition rate ultrashort laser pulses (150 fs, 1 kHz) at different wavelengths (2.86 and 4 μm) to investigate how the water peak absorption coefficient affects ablation thresholds, which reveals the dominating role of the multiphoton ionization (MPI) progress on the ablation threshold fluence. The results will be useful for photonic devices based on Ge–Sb–Se glasses applied in high-power laser operations to prevent ablation.

中文翻译：

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Ge-Sb-Se硫族化物玻璃的结构，水峰吸收和飞秒激光烧蚀特性之间的相关性

制造了一系列Ge _11.5 Sb _x Se _{88.5– x}（x = _{5、10、15、15、20、25、30}）硫族化物玻璃，旨在研究结构和水峰吸收在确定飞秒激光烧蚀阈值中的作用（F _th）。结果表明，随着Sb含量的增加，光学带隙减小，维氏硬度增加。同时，在飞秒激光烧蚀实验之前测量了拉曼光谱，这表明随着Sb浓度的增加，六个玻璃样品中的平均键能增加。用高重复频率的超短激光脉冲（150 fs，1 kHz）在不同的波长（2.86和4μm）上对样品盘进行消融，以研究水峰吸收系数如何影响消融阈值，这揭示了样品的主要作用多光子电离（MPI）在消融阈值通量上取得了进展。该结果对于在大功率激光操作中应用以Ge-Sb-Se眼镜为基础的光子器件以防止烧蚀将是有用的。