Du Tao-Yuan, Bian Xue-Bin
Opt Express. 2017 Jan 9;25(1):151-158. doi: 10.1364/OE.25.000151.
We introduce a quasi-classical model in the k space combined with the energy band structure of solids to understand the mechanisms of high-order harmonic generation (HHG) process occurring in a subcycle timescale. This model interprets the multiple plateau structure in HHG spectra well and the linear dependence of cutoff energies on the amplitude of vector potential A0 of the laser fields. It also predicts the emission time of HHG, which agrees well with the results by solving the time-dependent Schrödinger equation (TDSE). It provides a scheme to reconstruct the energy dispersion relations in Brillouin zone and to control the trajectories of HHG by varying the shape of laser pulses. This model is instructive for experimental measurements.
我们引入了一种在k空间中的准经典模型，并结合固体的能带结构，以理解在亚周期时间尺度上发生的高次谐波产生（HHG）过程的机制。该模型很好地解释了HHG光谱中的多个平台结构以及截止能量与激光场矢量势A0振幅的线性关系。它还预测了HHG的发射时间，这与通过求解含时薛定谔方程（TDSE）得到的结果吻合得很好。它提供了一种在布里渊区重建能量色散关系并通过改变激光脉冲形状来控制HHG轨迹的方案。该模型对实验测量具有指导意义。
