【摘 要】
:
熔石英元件的激光损伤问题一直是大功率激光器性能提升的瓶颈。以往对熔石英的损伤多为后验研究,即损伤之后通过形貌分析反推物理机制,对实时损伤过程的研究报道较少。我们
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熔石英元件的激光损伤问题一直是大功率激光器性能提升的瓶颈。以往对熔石英的损伤多为后验研究,即损伤之后通过形貌分析反推物理机制,对实时损伤过程的研究报道较少。我们利用泵浦探测成像技术,在纳秒时间分辨率上拍摄了熔石英元件损伤图像,获得了熔石英后表面的不同损伤阶段,并分析了激光波长、能量对损伤动力学的影响。结果表明,熔石英表面损伤过程伴随着微观尺度的等离子体形成和微米级粒子的喷射,过热爆炸机制及其诱导的瞬态应力波是产生这些瞬态微观现象的可能原因。
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