双色激光脉冲相位差对晶体发射高次谐波的影响  

Phase difference effect on high-order harmonic generation of crystals driven by two-color laser pulses

作　　者：姚云鹏 管仲[1] 李小勇 周效信[1] YAO Yun-Peng;GUAN Zhong;LI Xiao-Yong;ZHOU Xiao-Xin(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China;Experimental Center,Northwest University for Nationalities,Lanzhou 730030,China)

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070 [2]西北民族大学实验中心,兰州730030

出　　处：《原子与分子物理学报》2019年第2期273-278,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11764038;11564033;11465016)

摘　　要：通过数值求解双色激光场(基频场和二倍频场)与一维晶体相互作用的含时薛定谔方程,研究了晶体在双色激光脉冲驱动下发射高次谐波的特点.研究结果表明,晶体在双色激光脉冲驱动下发射的高次谐波第二平台强度相对于单色激光脉冲驱动下有显著提高,且随双色激光脉冲的相位差明显变化.进一步的研究发现,在双色激光脉冲其它参数保持不变的情况下,通过调节双色激光脉冲的相位差就能有效提高晶体发射高次谐波第二平台的产额,提高的幅度会随激光脉冲的宽度有所不同.We investigate the characteristics of the high-order harmonics generation(HHG) emitted from one-dimension crystals driven by the two-color combined field pulse based on the numerical solution of the time-dependent Schr?dinger equation of the crystal in the two-color laser fields(fundamental frequency field and double frequency field). We find that the strength of the second plateau of HHG is significantly enhanced, and changed with the phase difference of the double-color fields. Furthermore, when the other parameters of the two-color laser pulse remain unchanged, the HHG yield of crystals in the second plateau can be enhanced effectively by adjusting the phase difference of the two-color laser pulse, and the enhancement of HHG yield varies with the width of the laser pulses.

关 键 词：高次谐波 晶体 双色激光脉冲 相位差 

分 类 号：O562.[理学—原子与分子物理]