K9和熔石英玻璃纳秒基频激光损伤特性的实验对比研究

利用光学元件基频激光损伤测试平台,通过实验测试相同条件下K9和熔石英两类常用 光学元件的初始损伤阈值、损伤增长阈值和损伤增长规律,对比研究了两类光学元件的基频激光损伤特性.结果表明,K9和熔石英光学元件的初始损伤阈值基本相同,损伤面积增长都遵循指数性增长规律,损伤深度成线性增长.但两者损伤增长特性仍有很大的差别,与熔石英相比,K9激光损伤增长阈值较低,并且相同通量下的激光损伤增长更为迅速,通过两类光学材料抗压性能的巨大差异很好地解释了这一现象.该研究结果对国内高功率激光装置的透射光学材料工程应用有非常重要的参考价值.

Experimental comparison of damage performance induced by nanosecond 1ω laser between K9 and fused silica optics

The initial damage threshold, the damage growth threshold and the damage growth laws of K9 glass and fused silica glass are tested respectively in the same experimental condition with 1ω nanosecond laser. The comparison of the laser induced damage performance between the two glass materials is performed. The results show that the initial damage thresholds of the two glass materials are the same, the damage area growths both obey the exponential increase rule and their damage depth growths obey the linear increase rule. However, there is apparent difference in the rule of damage growth. For example, the damage growth threshold is lower and the damage growth coefficient is higher for K9 glass. This can be explained by the difference in the material mechanical strength between the two glass materials. The present research is very important for choosing transparent optical materials used in high power laser.