双色场中高次谐波产生（HHG）光谱控制因素的理论探索

Theoretical exploration of control factors for the high-order harmonic generation (HHG) spectrum in two-color field.

作者信息

Huang Xinting, Yang Dapeng, Yao Li

机构信息

Institute of Computational Physics, Department of Physics, Dalian Maritime University, Dalian 116026, PR China; Physics Laboratory, North China University of Water Resources and Electric Power, Zhengzhou 450011, PR China.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2014 Sep 15;130:19-23. doi: 10.1016/j.saa.2014.03.098. Epub 2014 Apr 2.

DOI:10.1016/j.saa.2014.03.098

PMID:24759780

Abstract

In this work, the laser-parameter effects on the high-order harmonic generation (HHG) spectrum and attosecond trains by mixing two-color laser field, a visible light field of 800 nm and a mid-infrared (mid-IR) laser pulses of 2400 nm, are theoretically demonstrated for the first time. Different schemes are applied to discuss the function of intensity, carrier-envelope phase (CEP) and pulse duration on the generation of an isolated attosecond pulse. As a consequence, an isolated 16as pulse is obtained by Fourier transforming an ultrabroad XUV continuum of 208 eV with the fundamental field of duration of 6 fs, 9×10(14)W/cm2 of intensity, the duration of 12 fs, the CEPs of the two driving pulses of -π and the relative strength ratio √R=0.2.

摘要

在本工作中，首次从理论上证明了通过混合800nm可见光场和2400nm中红外（mid-IR）激光脉冲这两种颜色的激光场，激光参数对高次谐波产生（HHG）光谱和阿秒脉冲序列的影响。应用不同方案来讨论强度、载波包络相位（CEP）和脉冲持续时间对孤立阿秒脉冲产生的作用。结果，通过对208eV的超宽极紫外连续谱进行傅里叶变换，利用持续时间为6fs、强度为9×10(14)W/cm2、持续时间为12fs、两个驱动脉冲的CEP为-π且相对强度比√R = 0.2的基频场，获得了一个孤立的16as脉冲。