Frequency shifts of high-order harmonics from ZnO crystals by chirped laser pulses  

作　　者：Yu Zhao Xiao-Jin Liu Shuang Wang Xiao-Xin Huo Yun-He Xing Jun Zhang 赵宇;刘晓瑾;王爽;霍晓鑫;邢云鹤;张军

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]School of Science,Shenyang Ligong University,Shenyang 110159,China

出　　处：《Chinese Physics B》2025年第3期340-346,共7页中国物理B(英文版)

基　　金：Project supported by the Natural Science Foundation of Jilin Province of China(Grant No.20230101014JC);the National Natural Science Foundation of China(Grant No.12374265)。

摘　　要：We investigate theoretically the effects of chirped laser pulses on high-order harmonic generation(HHG)from solids.We find that the harmonic spectra display redshifts for the driving laser pulses with negative chirp and blueshifts for those with positive chirp,which is due to the change in the instantaneous frequency of the driving laser for different chirped pulses.The analysis of crystal-momentum-resolved(k-resolved)HHG reveals that the frequency shifts are equal for the harmonics generated by different crystal momentum channels.The frequency shifts in the cutoff region are larger than those in the plateau region.With the increase of the absolute value of the chirp parameters,the frequency shifts of HHG become more significant,leading to the shifts from odd-to even-order harmonics.We also demonstrate that the frequency shifts of harmonic spectra are related to the duration of the chirped laser field,but are insensitive to the laser intensity and dephasing time.

关 键 词：high-order harmonic generation ZnO crystal chirped laser pulse spectral shift 

分 类 号：TN2[电子电信—物理电子学]