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arXiv 1707.03364physics.optics
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高次谐波产生中结构干扰的Laser诱导畸变

Laser-induced distortion of structural interferences in high harmonic generation

F. Risoud, C. Lévêque, M. Labeye, J. Caillat, A. Maquet, P. Salières, R. Taïeb, T. Shaaran

摘要:

从理论上研究了双原子分子高次谐波产生中的双中心干涉现象。通过求解含时薛定谔方程,无论是数值或与分子强场近似,我们表明,电子动力学的结果在一个强大的光谱平滑的干涉,依赖于驱动激光场的值和符号在重组。引人注目的是,相关的相位跳跃是在相反的方向为短和长的轨迹。在这些条件下,谐波发射不再简单地与复合偶极子成正比。这在高次谐波光谱学中具有重要的后果,例如,用于在幅度和相位上访问分子框架复合偶极子。

英文摘要:

We study theoretically the two-center interferences occurring in high harmonic generation from diatomic molecules. By solving the time-dependent Schroedinger equation, either numerically or with the molecular strong-field approximation, we show that the electron dynamics results in a strong spectral smoothing of the interference, depending on the value and sign of the driving laser field at recombination. Strikingly, the associated phase-jumps are in opposite directions for the short and long trajectories. In these conditions, the harmonic emission is not simply proportional to the recombination dipole any more. This has important consequences in high harmonic spectroscopy, e.g., for accessing the molecular-frame recombination dipole in amplitude and phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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