【摘要】 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。更多还原

【Abstract】 A major effort in ultrashort and ultrafast optics is to obtain subfemtosecond pulses from high harmonics generated by interaction of an intense short-pulse laser and a jet of rare gases.The chirped multilayer mirror in the extreme ultraviolet region can be used to select some high harmonics and compensate the chirp.It is an effective element for the production of subfemtosecond pulses.The mechanism of obtaining subfemtosecond pulses from high harmonics by using the mirror was presented.The chirp of high harmonics in specified experiment condition was calculated.The chirped multilayer mirror was designed by using a genetic algorithm.Its capability of producing subfemtosecond pulses was shown by numerical simulation.Results indicate that the designed chirped multilayer mirror can be used for production of 132 as pulses.更多还原