Spectral shift of solid high-order harmonics from different channels in a combined laser field

作     者：曹冬冬 潘雪飞 张军 刘学深 Dong-Dong Cao;Xue-Fei Pan;Jun Zhang;Xue-Shen Liu

作者机构：Institute of Atomic and Molecular PhysicsJilin UniversityChangchun 130012China College of ScienceNortheast Forestry UniversityHarbin 150040China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2023年第32卷第3期

页      面：244-251页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

基　　金：the National Natural Science Foundation of China(Grant Nos.12074142 and 11904122) 

主　　题：high-order harmonic generation ZnO crystal spectral shift of harmonics resonant electron injection channels 

摘      要：We investigate theoretically the spectral shift of the high-order harmonic generation(HHG)in ZnO driven by a combined laser field by solving the two-band semiconductor Bloch equations(SBEs)in the velocity *** combined laser field is synthesized by a fundamental laser pulse and its seventh-frequency laser *** the seventh-frequency laser pulse is added to the rising or falling parts of the fundamental laser field,we find that the spectral blueshift or redshift appears,which is due to the unequal contribution of the rising and falling parts in the fundamental laser field to the *** analyzing the time-dependent conduction band population in k space,we found that,in addition to the tunneling ionization channel,there is also the resonant electron injection channels which is induced by the seventh-frequency laser *** harmonics generated by the different channels show the spectral redshift or the spectral blueshift,*** analyzing the k-integrated transient conduction band population of the electrons from different channels,we found that if there is a certain delay in the process of the electron excitation,it will lead to the delay in the harmonic emission,which results in the spectral redshift of the harmonics.