高重复频率DPL激光对光学薄膜元件损伤实验研究

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高重复频率DPL激光对光学薄膜元件损伤实验研究摘　　要：光学薄膜的高重频激光损伤特性一直是激光薄膜研究者的重点。为了分析光学薄膜在高重频激光辐照下的损伤特性，探究其损伤机理，文中从实验出发，研究了重复频率10 kHz DPL激光对光学薄膜元件的损伤特性。结果表明，修正膜层内的驻波场分布，降低膜层内高折射材料中的驻波场峰值可以提高高重频激光损伤阈值；从激光损伤形貌与辐照激光功率的关系上看，在高重频激光辐照下光学薄膜元件的损伤实质上是热效应和场效应共同作用下产生的“微损伤”累积放大所造成的。当薄膜吸收率较小时，损伤主要表现为场效应所致的“微损伤”累积放大，当薄膜吸收率较大时，损伤主要表现为热效应所致的“微损伤”累积放大。 High repetition rate laser damage properties of optical coating have been the focus of the laser film researchers. In order to study the damage characteristics of optical coatings at high repetition rate laser irradiation, and explore the damage mechanism, in this paper, experimental study on the damage of optical thin film components at 10 kHz repetition rate DPL laser irradiation was made. The results show that modification of electric field distribution in the coatings, and reduce the peak value of electric field intensity of high refractive index material in the coatings can improve the laser damage threshold of coatings at high repetition rate laser irradiation. The damage mechanism of optical thin film components irradiated by repetition frequency laser was discussed. High repetition rate laser irradiation damage in substance is the ＆quot;micro-damage＆quot; accumulation of amplification which caused by the combination effect of thermal effect and field effect. When the absorption rate of coatings is small, the damage is mainly caused by the ＆quot;micro-damage＆quot; of filed effect cumulative amplification. When the absorption rate of coatings is high, that is mainly caused by the ＆quot;micro-damage＆quot; of thermal effect cumulative amplification.
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