论文部分内容阅读
对脉冲CO2激光损伤K9玻璃进行了实验与仿真研究。采用输出脉宽为10μs的脉冲CO2激光器对K9玻璃样品进行激光损伤实验,并且建立了脉冲CO2激光损伤K9玻璃的理论模型,利用有限元法对K9玻璃样品中的温度和应力分布进行数值分析。研究表明,K9玻璃的损伤阈值为6.533 J/cm2;入射激光能量密度越高,样品的损伤程度就越大,并且多脉冲对样品的损伤程度明显大于单脉冲;在激光能量较强的情况下,K9玻璃表面在光斑区域内形成熔融损伤和由压缩应力造成的应力损伤,在光斑区域外围则形成由环向拉伸应力造成的应力损伤,仿真分析结果与实验结果吻合良好。
Experimental and simulation studies on K 2 CO2 laser damaged glass were carried out. The laser damage experiment of K9 glass with pulsed CO2 laser with pulse width of 10μs was performed. The theoretical model of K9 glass with pulsed CO2 laser was established. The temperature and stress distribution in K9 glass were numerically analyzed by finite element method. The results show that the damage threshold of K9 glass is 6.533 J / cm2. The higher the incident laser energy density is, the more damage the sample will be, and the damage of the multi-pulse to the sample is obviously greater than that of the single pulse. When the laser energy is high , K9 glass surface melts damage and stress damage caused by compressive stress in the spot area and stress damage caused by the tensile stress in the periphery of the spot area. The simulation results are in good agreement with the experimental results.