Two-color-driven enhanced high-order harmonic generation in solids
Two-color-driven enhanced high-order harmonic generation in solids
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DOI：
10.1103/physreva.102.063123
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发表时间：
2020-12
影响因子：
2.9
通讯作者：
F. Navarrete;U. Thumm
中科院分区：
文献类型：
--
作者：
F. Navarrete;U. Thumm
我们从理论上研究了双色几个周期的驱动脉冲在模型晶体中的高次谐波辐射的发射，这些脉冲是由中红外基波脉冲及其二次谐波的相位相干叠加组成的。调整模型的晶体参数，以重现最低的带隙的MgO，我们研究在何种程度上不同的域的HH光谱可以控制和增强通过调谐的双色驱动激光电场的时间分布。在保持驱动脉冲能量不变的情况下，通过改变驱动脉冲的基波与二次谐波的振幅比和延迟来改变驱动脉冲的形状。对于合适的振幅比和延迟，我们发现一个高达五倍的频谱HH产量和HH截止频率的显着移位增强。
We theoretically investigate the emission of high-harmonic (HH) radiation in model crystals by bichromatic few-cycle driving pulses that are composed as the phase-coherent superposition of a mid-infrared fundamental pulse and its second harmonic. Adjusting the model-crystal parameters to reproduce the lowest band gap of MgO, we examine the extent to which distinct domains of the HH spectrum can be controlled and enhanced by tuning the temporal profile of the bichromatic driving laser electric field. We change the driving-pulse shape by varying its fundamental-versus-second-harmonic pulse amplitude ratio and delay, while keeping the energy of the driving laser pulse fixed. For suitable amplitude ratios and delays, we find an up to fivefold enhancement of the spectral HH yield and significant shifts of the HH cutoff frequency.