选择单次谐波光束的无色散单色化方法
Dispersion-free monochromatization method for selecting a single-order harmonic beam
摘要：
提出了一种利用多层膜反射镜实现多阶高次谐波单色化的方法。利用该方法设计的多层膜反射镜实现了从多阶谐波光束中提取单阶谐波，在软X射线波段具有宽带可调性和高反射率。此外，所提出的单色化方法可以保持飞秒到阿秒的脉冲宽度的反射光束。该装置对于需要高次谐波光束的超快软X射线实验，如飞秒/阿秒、时间分辨、泵浦-探测光谱学，非常有用。
英文摘要：
We propose a method to monochromatize multiple orders of high harmonics by using a proper designed multilayer mirror. Multilayer mirrors designed by our concept realize the perfect extraction of a single-order harmonic from multiple-order harmonic beam, and exhibit broadband tenability and high reflectivity in the soft-x-ray region. Furthermore, the proposed monochromatization method can preserve the femtosecond to attosecond pulse duration for the reflected beam. This device is very useful for ultrafast soft x-ray experiments that require high-order harmonic beams, such as femtosecond/attosecond, time-resolved, pump-probe spectroscopy.
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