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实验研究了纳秒激光脉冲聚焦到K9玻璃内部时产生损伤的特点,并基于激光等离子体冲击波的作用原理进行了理论分析。表面损伤的特点:当激光能量较小时,在入射激光的玻璃前表面不会产生损伤。随着激光能量的增加,会逐渐出现点坑状破坏,坑的中心是一个连接体损伤的核心,围绕该点的是完全融蚀区和最外部的环状破坏区。体损伤的形貌特点是沿激光入射方向呈纺锤状,破坏区中心有一条等离子通道,四周是断裂区和折射率区。在玻璃前表面上高斯激光脉冲产生激光支持爆轰波的特点是中间部分温度最高、运动速度最快、作用压强最大,从内到外逐渐减小,所以破坏程度也逐渐减小,呈辐射状分布。而玻璃内部的体损伤特点是由激光等离子体膨胀产生的冲击波作用由里到外逐渐减小的规律所决定的。
The characteristics of the damage generated when the nanosecond laser pulse is focused on the interior of the K9 glass are experimentally studied, and the theoretical analysis is made based on the action principle of the laser plasma shock wave. Characteristics of surface damage: When the laser energy is small, there is no damage on the front surface of the incident laser glass. With the increase of laser energy, there will be a gradual cratering. The center of the crater is the core of a connector body damage. Around this point there is a complete ablation zone and the outermost annular failure zone. Body morphology is characterized by damage along the incident laser was spindle-shaped, destruction of the center of a plasma channel, surrounded by the fault zone and the refractive index zone. The laser-supported detonation wave generated by the Gaussian laser pulse on the front surface of the glass is characterized by the highest temperature, the fastest moving velocity and the largest pressure in the middle part. The detonation wave gradually decreases from the inside to the outside, distributed. The internal damage of the glass body is characterized by the laser plasma expansion caused by the impact of shock wave from the inside to the outside of the law gradually decides.