不对称外场驱动下高次谐波宏观效应研究

项目名称： 不对称外场驱动下高次谐波宏观效应研究

项目编号： No.61308029

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 向阳

作者单位： 河南理工大学

项目金额： 26万元

中文摘要： 本项目主要进行原子气体在不对称外场驱动下高次谐波宏观效应的研究，考察高次谐波谱的强度、相干特性以及空间分布对入射光束的聚焦特性、气体密度以及传播距离的依赖关系。基于我们在强场激光与原子相互作用产生高次谐波的过程中提出的驱动场的不对称性导致高次谐波截止频率提高这一物理机制，结合传播效应能对电子运动轨道进行选择的特点，研究在多周期激光脉冲驱动下产生超宽相干连续谱的物理机制以及获取亚50阿秒脉冲的理论方案。

中文关键词： 高次谐波；宏观效应；不对称激光场；阿秒脉冲；阈上电离

英文摘要： The macroscopic effects of high-order harmonic generation of monoatomioc gas driven by asymmetry electric fields will be investigated in this project, which include the intensity, coherence and spatial distribution of high-order harmonic spectrum variation with the focus property of the incident light beam, gas density and propagation distance. In our previous works on the high-order harmonic generation of atoms drvien by strong laser fields, we proposed a novel physical mechanism that the asymmetry of the driver field leads to the extension of the high-order harmonic spectrum cutoff. Based on this mechanism, we will explore the mechanism of ultra-broad coherent continuum spectrum generation and the scheme for the generation of sub-50 attoseond pulse driven by multi-cycle laser pulses, considering the propagation effect which can select the electron trajectory.

英文关键词： high-order harmonic generation；macroscopic effects；asymmetrical laser field；attosecond pulse；above-threshold ionization