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对脉冲CO2激光在不同重频模式下损伤K9玻璃进行了实验研究。采用输出能量为10 J,脉宽为90 ns,重复频率在100 Hz至300 Hz之间连续可调的脉冲CO2激光器,对K9玻璃样品进行了激光损伤实验,观察到两次不同重频条件下样品的损伤形貌。实验结果表明,重频越高,对样品的损伤程度就越严重;应力损伤成为K9玻璃激光损伤的最主要的原因,在重频强激光的辐照下,K9玻璃表面出现强烈的等离子体闪光,伴随明显的熔融气化破坏,并形成等离子体爆轰波。爆轰波对玻璃材料产生了严重的力学冲击作用,这种应力作用足以对K9玻璃造成毁灭性破坏。运用有限元分析对激光辐照K9玻璃的温度与应力分布进行仿真,其计算结果与实验基本吻合。
The experiment of pulsed CO2 laser damage K9 glass in different frequency repetition mode was carried out. The K9 glass samples were laser-irradiated by a pulsed CO2 laser with an output energy of 10 J, a pulse width of 90 ns and a repetition rate of 100 Hz to 300 Hz. Two different repetition rates Sample damage morphology. The experimental results show that the higher the repetition frequency, the more serious the damage to the sample. The stress damage is the main reason of K9 glass laser damage. Under the intense laser irradiation, the intense plasma flash appears on the surface of K9 glass , Accompanied by significant melting gasification damage, and the formation of plasma detonation waves. Detonation waves have a severe mechanical impact on the glass material, which is sufficient to cause destructive damage to the K9 glass. The temperature and stress distribution of laser irradiated K9 glass were simulated by finite element analysis. The calculated results are in good agreement with the experiment.