采用双色激光场和低频电场合成拓宽高次谐波谱

Expanding the High-order Harmonic Spectrum by Using the Combination of a Two-color Laser Pulse and a Low-frequency Field

本文采用了一种在双色激光场上叠加低频电场的方法来拓宽高次谐波谱的平台区域.计算中,我们针对氦原子体系数值求解了一维含时薛定谔方程,并结合电子的时频分布图,分析了低频电场对高次谐波谱产生过程的影响.计算结果表明,该方案可以有效地拓宽谐波谱的平台区域.

A method to expand the plateau of high-order harmonic spectrum by using the combination of a two-color laser pulse and a low-frequency field is proposed. We numerically solve time-dependent Schrfdinger equation for the one-dimensional model of helium atom in an intense laser field, analyze the influence of low-fre- quency field on high-order harmonic generation with time-frequency distribution. Results show that the plateau of harmonic spectrum extended efficiently by using the scheme.