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arXiv 1310.0940physics.optics
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仅偶次高次谐波的准相位匹配

Quasi-phase-matching of only even-order high harmonics

Tzvi Diskin, Oren Cohen

摘要:

我们提出了一种只产生偶次高次谐波的方法。我们制定了一个条件,在双色驱动程序之间的相对相位的转变,导致现场符号翻转的偶次谐波。在传播过程中周期性地感应这种符号翻转,只产生偶次谐波的准相位匹配。我们证明了这种技术的数值,也表明它导致阿秒脉冲序列具有恒定的载波包络相位与高重复率。这项工作打开了大门,准相位匹配的高次谐波与设计的选择性增强功能。

英文摘要:

We propose a method for generating only even-order high harmonics. We formulate a condition for a shift in the relative-phase between bi-chromatic drivers that leads to a field sign-flip of only even-order harmonics. Induction of this sign-flip periodically during propagation gives rise to quasi phase matching of only even harmonics. We demonstrate this technique numerically and also show that it leads to attosecond pulse trains with constant carrier envelop phase with high repetition rate. This work opens the door for quasi-phase matching of high harmonics with a designed selective enhancement function.

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