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超短超强激光与稀有气体相互作用产生高次谐波获取亚飞秒脉冲是近年来超短超快光学的研究热点之一。具有谐波选择和啁啾补偿作用的极紫外啁啾多层膜反射镜是产生亚飞秒脉冲的有效元件。阐述了运用极紫外啁啾多层膜反射镜由高次谐波得到亚飞秒脉冲的机制,计算了特定实验条件下高次谐波产生过程中的啁啾,利用遗传算法完成了极紫外啁啾多层膜反射镜的设计,模拟分析了其产生亚飞秒脉冲的作用。结果表明,所设计极紫外啁啾多层膜反射镜能够获得半峰全宽为132 as的脉冲。
Ultrashort super laser and rare gas interaction to produce higher harmonics to obtain sub-femtosecond pulse ultra-short ultra-fast optical in recent years, one of the hot spots. EUV chirped multilayer mirrors with harmonic selection and chirp compensation are effective components for generating sub-femtosecond pulses. The mechanism of obtaining sub-femtosecond pulses from high-order harmonics by using extreme-ultraviolet chirped multilayer mirrors is described. The chirp in the generation of higher-order harmonics under specific experimental conditions is calculated, and the extreme ultraviolet warping The design of the chirped multi-layer mirror was simulated to analyze the effect of sub-femtosecond pulse. The results show that the designed EUV chirped multilayer mirror can obtain the pulse with full width at half maximum as 132 as.