原子发射高次谐波偏振态的调控  

Control of Polarization States of Atomic High-order Harmonic Generation

作　　者：李志江 王国利[1] 焦志宏[1] 李小勇 周效信[1] LI Zhijiang;WANG Guoli;JIAO Zhihong;LI Xiaoyong;ZHOU Xiaoxin(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China;Electrical Engineering College of Northwest University for Nationalities,Northwest Minzu University,Lanzhou 730070,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]西北民族大学电气工程学院,兰州730070

出　　处：《光子学报》2021年第6期161-167,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11864037,91850209,11765018,11964033);西北师范大学基金(No.NWNU-LKQN-17-1)。

摘　　要：利用分裂算符法数值求解二维含时薛定谔方程研究了He原子在反旋双色组合激光场(由椭圆极化的基频场与圆极化的三倍频场构成)中产生高次谐波的偏振特性。研究结果表明,改变基频场的椭偏率、强度及相位可实现对高次谐波偏振态从圆偏振到椭圆偏振以及线偏振的完全调控,为实验室产生偏振态可控的紫外-软X射线光源提供了参考。The polarization of high-order harmonics radiated from He driven by counter-rotating two-color laser field,which consists of a elliptically polarized fundamental field and its counter-rotating circular third harmonic pulse,are investigated by numerically solving the two-dimensional time-dependent Schr?dinger equation with split operator method.The simulations show that the polarization state of harmonics can be fully controlled from circular polarization,through elliptically,to linearly polarized harmonics,by adjusting the ellipticity,intensity and phase of the fundamental field.This research is helpful for the generation of extreme utilityvehicle and X-ray sources with controllable polarization states in the experiment.

关 键 词：高次谐波 反旋双色激光场 偏振态 调控 

分 类 号：O562.4[理学—原子与分子物理]