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多波长飞秒激光损伤可见光滤光片的实验及机理

Keywords: 激光损伤,飞秒激光,光学薄膜,损伤阈值,干涉场

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Abstract:

针对飞秒激光作用光学薄膜过程中损伤阈值与激光波长的关系问题,利用近红外波段波长可调谐的高重频飞秒脉冲激光,对可见光滤光片光谱通带的过渡区域进行了背向损伤实验,测量了不同波长下的平均功率密度损伤阈值,并从飞秒激光作用的雪崩电离过程出发,推导并计算了该阈值与薄膜干涉场分布的关系,理论结果较好地预测了不同波长下平均功率密度损伤阈值的发展趋势。该研究表明,该实验条件下薄膜的飞秒激光损伤是整体行为,同一样品中,干涉场分布的平均值越高即膜层中瞬时驻留的激光能量越大时,相应损伤阈值越低。

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