论文标题

X射线参数扩增中的非线性传播效应在高谐波中

Nonlinear propagation effect in x-ray parametric amplification during high harmonic generation

论文作者

Seres, J., Seres, E., Serrat, C., Dinh, T. H., Hasegawa, N., Ishino, M., Nishikino, M., Nakano, K., Namba, S.

论文摘要

我们报告使用双气射流装置中的HE气体在100 eV左右的高谐波生成中的参数扩增的实现和表征。种子XUV脉冲相对于放大器气射流的延迟通过更改气流之间的距离来扫描。实验和数值计算表明,参数放大发生在几个光学周期的时间窗口内。在较短的光周期延迟范围内观察到种子和放大器之间的强相关性,这是对XUV强度的调制,具有意想不到的一个光学周期性,而不是一半的光学循环。模拟显示,强相关性以及异常周期性是血浆分散体对放大器射流传播过程中参数放大过程产生的非线性效应的结果。

We report the realization and characterization of parametric amplification in high harmonic generation around 100 eV using He gas in a double gas jet arrangement. The delay of the seed XUV pulse with respect to the amplifier gas jet was scanned by changing the distance between the gas jets. Experiments and numerical calculations show that parametric amplification occurs within a temporal window of several optical cycles. Strong correlation between the seed and amplifier was observed in a shorter, few optical cycles delay range, which appeared as a modulation of the XUV intensity with an unexpected one optical cycle periodicity instead of half optical cycle. Simulations revealed that the strong correlation and also the unusual periodicity was the consequence of the nonlinear effect produced by plasma dispersion on the parametric amplification process during propagation in the amplifier jet.

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