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Multiple-acceleration in “W” waveform structure for high-order harmonic improvement
Journal of Nonlinear Optical Physics & Materials ( IF 2.9 ) Pub Date : 2020-03-11 , DOI: 10.1142/s0218863519500371
Hui Liu 1 , Yi Li 1 , Hang Liu 1 , A. Yuanzi Feng 1, 2 , Liqiang Feng 1 , Yan Qiao 1, 3
Affiliation  

Generally, high-order harmonic generation (HHG) from atoms and molecules can be explained by the “ionization-acceleration-recombination” model and the classical results are agreement with the quantum results. In this paper, we report a multiple-acceleration process in the “[Formula: see text]” waveform structure. It is found that due to the nonzero initial velocity in the multiple-acceleration process, the emitted photon energies from the quantum results are larger than those from the classical results. Moreover, with the optimization of this “[Formula: see text]” waveform structure, much more energy can be obtained for the accelerated electron, thus leading to the improvement of the HHG. Further, with the introduction of a half-cycle pulse, the effects of the two “[Formula: see text]” structures in the “[Formula: see text]” structure on the HHG are discussed. It shows that the latter “[Formula: see text]” structure plays the more important role in HHG modulation. Finally, through the Fourier transformation of the spectral continuum, a number of sub-40 as pulses with intensity enhancements of 1 order and 2 orders of magnitudes can be obtained, respectively.

中文翻译:

“W”波形结构中的多重加速,用于改善高次谐波

一般来说,原子和分子的高次谐波产生(HHG)可以用“电离-加速-复合”模型来解释,经典结果与量子结果一致。在本文中,我们报告了“[公式:见文本]”波形结构中的多重加速过程​​。研究发现,由于多次加速过程中的初始速度非零,量子结果的发射光子能量大于经典结果的光子能量。此外,通过对这种“[公式:见正文]”波形结构的优化,加速电子可以获得更多的能量,从而改善HHG。此外,随着半周期脉冲的引入,“[公式:见正文]”中的两个“[公式:见正文]”结构的效果:见文本]”结构上的 HHG 进行了讨论。这表明后一种“[公式:见正文]”结构在 HHG 调制中起着更重要的作用。最后,通过光谱连续谱的傅里叶变换,可以得到多个亚40个脉冲,强度分别增强1个数量级和2个数量级。
更新日期:2020-03-11
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