双色laser场驱动原子和排列分子产生太赫兹波的理论研究
Theoretical study of terahertz generation from atoms and aligned molecules driven by two-color laser fields
摘要：
通过求解含时薛定谔方程（TDSE），研究了超短基频激光及其二次谐波场驱动下原子和分子产生太赫兹辐射。一维、二维和三维TDSE数值模拟的比较表明，初始电离波包及其在激光场中的加速和长程库仑势的再散射起着关键作用。我们还提出了太赫兹辐射的最佳相位延迟和产量的激光强度，波长，持续时间，和双色激光成分的比例的依赖关系。通过与高次谐波发射的比较，进一步研究了模型氢分子产生太赫兹波的机理。结果表明，太赫兹产额随取向度的变化与电离率有关，而最佳双色相位延迟随取向度的变化很小，反映了阿秒电子动力学的取向关系.最后，我们表明，太赫兹辐射可能被用来澄清在高次谐波产生的干扰的起源，从对齐的分子，同时测量的角度分辨太赫兹产额。
英文摘要：
We study the generation of terahertz radiation from atoms and molecules driven by an ultrashort fundamental laser and its second harmonic field by solving time-dependent Schrödinger equation (TDSE). The comparisons between one-, two-, and three- dimensional TDSE numerical simulations show that initial ionized wave-packet and its subsequent acceleration in the laser field and rescattering with long-range Coulomb potential play key roles. We also present the dependence of the optimum phase delay and yield of terahertz radiation on the laser intensity, wavelength, duration, and the ratio of two-color laser components. Terahertz wave generation from model hydrogen molecules are further investigated by comparing with high harmonic emission. It is found that the terahertz yield is following the alignment dependence of ionization rate, while the optimal two-color phase delays varies by a small amount when the alignment angle changes from 0 to 90 degrees, which reflects alignment dependence of attosecond electron dynamics. Finally we show that terahertz emission might be used to clarify the origin of interference in high harmonic generation from aligned molecules by coincidently measuring the angle-resolved THz yields.
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