The simplest route to generating a train of attosecond pulses
The simplest route to generating a train of attosecond pulses
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DOI：
10.1038/lsa.2013.14
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
K. Yoshii;John Kiran Anthony;M. Katsuragawa
中科院分区：
文献类型：
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作者：
K. Yoshii;John Kiran Anthony;M. Katsuragawa
我们报道了两种从近红外-可见光-紫外线范围内的宽离散光谱产生阿秒脉冲的新方法。一种是将整数-时间-Talbot(ITT)概念扩展到包括高阶谱色散，并产生完全满足变换限制条件的脉冲串。另一种是数值模拟，探讨了获得近似满足变换极限条件的阿秒脉冲序列的最佳条件。第二种方法比第一种方法更实用。这两种方法都是非常简单和健壮的；我们只需要在光路中放置一些薄层色散材料，并在不分散频率分量的情况下调整它们的厚度。我们数值演示了在气态仲氢中产生的阿秒脉冲序列，其变换极限脉冲宽度为728as，重复周期为8.03fs。
We report on two novel routes to generating a train of attosecond pulses from a broad discrete spectrum in the near-infrared–visible–ultraviolet range. One extends an integer-temporal-Talbot (ITT) concept to include high-order spectral dispersions and generates a pulse train that completely satisfies the transform-limited condition. The other numerically explores the optimum conditions under which we can obtain an attosecond pulse train that approximately satisfies the transform-limited condition. The second method is more practical than the first. Either of these methods is extremely simple and robust; we need only to place a few thin dispersive materials in the optical path and to adjust their thicknesses without spatially dispersing the frequency components. We numerically demonstrate the generation of a train of attosecond pulses with a transform-limited pulse duration of 728 as and a repetition period of 8.03 fs in gaseous parahydrogen.