高次谐波产生中量子路径的光谱分辨时空特性
Spectrally resolved spatiotemporal features of quantum paths in high-order harmonic generation
摘要：
我们从光谱和空间分辨的谐波谱中，实验上解开了不同量子路径对高次谐波产生的贡献。通过调节激光强度和聚焦位置，我们同时观察到了短光路和长光路的光谱分裂、频率偏移和谐波产额的强度调制。基于模拟结果，我们区分了量子路径干涉和宏观干涉效应导致的高次谐波强度相关调制的物理机制。此外，它表明，不同的量子路径的原子偶极相位编码的频移。反过来，它使我们能够恢复原子偶极相位和时间啁啾的不同的量子路径从测量的谐波谱。这一结果给出了一个信息映射的时空和光谱特征的量子路径在HHG。
英文摘要：
We experimentally disentangle the contributions of different quantum paths in high-order harmonic generation (HHG) from the spectrally and spatially resolved harmonic spectra. By adjusting the laser intensity and focusing position, we simultaneously observe the spectrum splitting, frequency shift and intensity-dependent modulation of harmonic yields both for the short and long paths. Based on the simulations, we discriminate the physical mechanisms of the intensity-dependent modulation of HHG due to the quantum path interference and macroscopic interference effects. Moreover, it is shown that the atomic dipole phases of different quantum paths are encoded in the frequency shift. In turn, it enables us to retrieve the atomic dipole phases and the temporal chirps of different quantum paths from the measured harmonic spectra. This result gives an informative mapping of spatiotemporal and spectral features of quantum paths in HHG.
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