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arXiv 1701.01640physics.atom-ph
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双色干涉高次谐波产生的脉冲形状控制

Pulse-shape control of two-color interference in high-order-harmonic generation

K. R. Hamilton, H. W. van der Hart, A. C. Brown

摘要:

我们报告的计算谐波产生氖在混合(800 nm +延时400 nm)激光脉冲计划。与之前的研究相比,我们采用了短(几个周期)400 nm脉冲,发现这可以控制导致截止谐波的电子轨迹之间的干扰。包含的400 nm的脉冲提高了产量和截止能量,这两者都表现出强烈的依赖于两个脉冲之间的时间延迟。使用时间依赖性R-矩阵理论和经典的轨迹模型相结合,我们评估导致这些影响的机制。

英文摘要:

We report on calculations of harmonic generation by neon in a mixed (800-nm + time-delayed 400-nm) laser pulse scheme. In contrast with previous studies we employ a short (few-cycle) 400-nm pulse, finding that this affords control of the interference between electron trajectories contributing to the cutoff harmonics. The inclusion of the 400-nm pulse enhances the yield and cutoff energy, both of which exhibit a strong dependence on the time delay between the two pulses. Using a combination of time-dependent R-matrix theory and a classical trajectory model, we assess the mechanisms leading to these effects.

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