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首页> 外文期刊>Physical Review, A. Atomic, molecular, and optical physics >Enhanced high-order harmonics and an isolated short attosecond pulse generated by using a two-color laser and an extreme-ultraviolet attosecond pulse
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Enhanced high-order harmonics and an isolated short attosecond pulse generated by using a two-color laser and an extreme-ultraviolet attosecond pulse

机译：通过使用双色激光和极紫外阿秒脉冲产生增强的高次谐波和孤立的短阿秒脉冲

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摘要

An efficient method to generate an isolated short attosecond pulse is presented theoretically. We show that, by adding a 0.5 fs, 62.3 nm extreme ultraviolet (xuv) attosecond pulse to a synthesized two-color field at a proper time, the harmonic intensity is effectively enhanced by 1-3 orders of magnitude compared with the twocolor case and the harmonic spectrum higher than 260th order reveals an ultrabroad xuv supercontinuum. In addition, the short quantum path is selected to effectively contribute to the high order harmonics, and an isolated 40 as pulse is obtained. Our calculated results also show that, by adding a 0.5 fs, 29.6 nm xuv attosecond pulse to the synthesized two-color field at a proper time, the enhancement of the high-order harmonics and an ultrabroad xuv supercontinuum is observed, and the selection of the long quantum path can be achieved, then an isolated attosecond pulse as short as 39 as is generated.
机译：理论上提出了一种有效的产生孤立的短阿秒脉冲的方法。我们显示，通过在适当的时间将0.5 fs，62.3 nm的极紫外（xuv）阿秒脉冲添加到合成的双色场中，与双色情况相比，谐波强度有效提高了1-3个数量级，并且高于260阶的谐波频谱揭示了超宽xuv超连续谱。另外，选择短量子路径以有效地有助于高次谐波，并且获得隔离的40作为脉冲。我们的计算结果还表明，通过在适当的时间向合成的双色场添加0.5 fs，29.6 nm xuv阿秒脉冲，可以观察到高次谐波和超宽xuv超连续谱的增强，并且选择了可以实现长的量子路径，然后产生一个短至39的孤立的阿秒脉冲。

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