使用多色合成激光场拓展高次谐波谱平台区域的宽度

本文提出了一种多色合成激光方案用来有效的提高高次谐波谱平台区域的宽度. 我们首先通过在800nm基本激光脉冲上添加一束或者两束控制激光脉冲在理论上得到双色以及三色合成激光场；其次，通过求解一维含时薛定谔方程，计算得到了在多色合成激光场条件下的高次谐波谱，计算结果表明，多色合成激光场方案可以有效的拓展高次谐波谱的平台区域；最后，我们结合电子的经典回碰动能分布以及时频分布，分析了在多色场条件下高次谐波谱平台区域拓宽的机理和微观机制.

Expending the plateau of high-order harmonic spectrum by

We propose a scheme to extend the plateau of high-order harmonic spectrum by using multi-color synthesized laser field. Firstly, the two-color and three-color laser fields are synthesized by adding control laser pulse to the 800nm fundamental pulse. Secondly, the high-order harmonic spectra are presented via numerically solving the one-dimensional time-dependent Schr¨odinger equation in multi-color synthesized laser field, and the results show that the width can be expended effectively. Finally, the high-order harmonic spectra are explained reasonably by means of classical returning kinetic-energy map and the time-frequency distribution.