An investigation on 800 nm femtosecond laser ablation of K9 glass in air and vacuum

作者：Xu, Shi-zhen^*; Yao, Cai-zhen; Dou, Hong-qiang; Liao, Wei^*; Li, Xiao-yang; Ding, Ren-jie; Zhang, Li-Juan; Liu, Hao; Yuan, Xiao-dong; Zu, Xiao-tao

来源：Applied Surface Science, 2017, 406: 91-98.

DOI：10.1016/j.apsusc.2017.02.043

• Femtosecond laser
• K9 glass
• Laser ablation
• Ablation rate
• Laser-induced damage threshold
• Laser materials processing

Ablation rates of K9 glass were studied as a function of femtosecond laser fluences. The central wavelength was 800 nm, and pulse durations of 35 fs and 500 fs in air and vacuum were employed. Ablation thresholds of 0.42J/cm(2) and 2.1 J/cm(2) were obtained at 35 fs and 500 fs, respectively, which were independent with the ambient conditions and depend on the incident pulse numbers due to incubation effects. The ablation rate of 35 fs pulse laser increased with the increasing of laser fluence in vacuum, while in air condition, it slowly increased to a plateau at high fluence. The ablation rate of 500 fs pulse laser showed an increase at low fluence and a slow drop of ablation rate was observed at high fluence in air and vacuum, which may due to the strong defocusing effects associated with the non-equilibrium ionization of air, and/or the shielding effects of conduction band electrons (CBEs) produced by multi-photon ionization and impact ionization in K9 glass surface. The typical ablation morphologies, e.g. smooth zone and laser-induced periodic surface structures (LIPSS) were also presented and illustrated.

• 出版日期2017-6-1
• 单位中国工程物理研究院; 电子科技大学