Abstract We present the response of the electron to a weak XUV pulse in the presence of an intense IR 800 nm laser field. Simulations are performed on an aligned molecular ion H 2 + by numerically solving the corresponding time-dependent Schrodinger equation. It is found that high order harmonic generation (HHG) spectra exhibit signature of harmonic humps, which is shown to be sensitive to the XUV pulse polarization and frequency, and the time delay between the two pulses. Harmonic humps correspond to the perturbative XUV absorption. The enhancement of harmonic humps in IR fields allows to control electron dynamics by XUV-IR combined fields in HHG processes.

中文翻译：

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通过弱 XUV 和强 IR 激光脉冲组合在排列分子中产生高次谐波

摘要 我们展示了在强 IR 800 nm 激光场存在下电子对弱 XUV 脉冲的响应。通过数值求解相应的时间相关薛定谔方程，对排列的分子离子 H 2 + 进行模拟。发现高次谐波产生 (HHG) 光谱表现出谐波峰的特征，这对 XUV 脉冲极化和频率以及两个脉冲之间的时间延迟很敏感。谐波峰对应于微扰 XUV 吸收。IR 场中谐波峰的增强允许在 HHG 过程中通过 XUV-IR 组合场控制电子动力学。