通过双色场和静电场的合成来拓宽高次谐波谱

本篇文章提出了一种通过双色激光场和静电场合成来拓宽高次谐波谱平台区域的方案.我们针对氦原子数值求解了一维含时薛定谔方程,并且得到了不同合成激光场条件下的高次谐波谱,并结合了经典电离-回碰动能分布图和时频分布图分析了静电场对高次谐波谱产生过程的影响.计算结果表明,通过在双色激光场上叠加一个静电场,可以有效地拓宽高次谐波谱的平台区域,从而得到一个频带宽度为358eV的超连续谱.

Expanding the high-order harmonic spectrum by

An efficient method to extend the plateau of high-order harmonic spectrum by using the combination of a two-color laser field and a static electric field is presented. We numerically solve one-dimensional time-dependent Schrödinger equation of helium atom and the high-order harmonic spectrum in different synthesized field can be obtained, meanwhile, analyzing the influence of static electric field on high-order harmonic generation (HHG) with classical returning kinetic-energy map and time-frequency distribution. The results show that, by adding a static electric field to a synthesized two-color laser field, the width of the plateau can be expanded efficiently, and a bandwidth of nearly 358eV can be received.