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高功率激光器中,金属颗粒作为元件表面污染的一种,对熔石英元件寿命的影响早已得到关注。为了定量得到金属颗粒对熔石英元件损伤阈值的影响,在中国科学院上海光学精密机械研究所薄膜中心的标准损伤测试平台上,对未被污染的以及被3种不同金属颗粒(Al、Cu、Fe)污染的熔石英元件的损伤阈值进行了测量。研究发现,被金属颗粒污染的熔石英元件,损伤阈值会降低为原来的20%～30%;吸收系数高的金属颗粒更容易诱导损伤,损伤形貌与未污染的熔石英损伤形貌也有很大的差别;离线观测样品形貌,可以从微观的角度观察到损伤的概率行为。参考损伤的爆炸模型,粗略地模拟了温度随时间的变化。
In high-power lasers, the influence of metal particles on the surface of a component has long been a concern for the lifetime of the fused silica. In order to quantitatively determine the influence of metal particles on the damage threshold of the fused silica, a series of experiments were performed on the standard damage test platform of the thin film center of Shanghai Institute of Optics, Fine Mechanics and Fine Mechanics, Chinese Academy of Sciences. ) Contamination threshold of the fused silica element was measured. The results show that the damage threshold of fused-silica fused with metal particles will be reduced to 20% ~ 30%, and the metal particles with high absorption coefficient are more likely to induce damage, damage morphology and the morphology of uncontaminated fused silica. Big difference; Off-line observation of sample morphology, from the microscopic point of view to observe the probability of damage behavior. With reference to the explosion model of damage, the temperature is roughly modeled as a function of time.