Role of Bloch oscillation in high-order harmonic generation from periodic structure  

作　　者：Lu Liu Jing Zhao Jian-Min Yuan Zeng-Xiu Zhao 刘璐;赵晶;袁建民;赵增秀(Graduate School of China Academy of Engineering Physics,Beijing 100193,China;Department of Physics,College of Liberal Arts and Science,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]Graduate School of China Academy of Engineering Physics,Beijing 100193,China [2]Department of Physics,College of Liberal Arts and Science,National University of Defense Technology,Changsha 410073,China

出　　处：《Chinese Physics B》2019年第11期60-66,共7页中国物理B（英文版）

基　　金：Project supported by the NSAF,China(Grant No.U1730449);the National Natural Science Foundation of China(Grant Nos.11904341,11774322,91850201,and 11874066)

摘　　要：The high-order harmonic generation from a model solid structure driven by an intense laser pulse is investigated using the semiconductor Bloch equations(SBEs). The main features of harmonic spectrum from SBEs agree well with the result of the time-dependent Schro¨dinger equation(TDSE), and the cut-off energy can be precisely estimated by the recollision model. With increasing the field strength, the harmonic spectrum shows an extra plateau. Based on the temporal population of electron and the time–frequency analysis, the harmonics in the extra plateau are generated by the Bloch oscillation. Due to the ultrafast time response of the Bloch electron, the generated harmonics provide a potential source of shorter isolated attosecond pulse.The high-order harmonic generation from a model solid structure driven by an intense laser pulse is investigated using the semiconductor Bloch equations(SBEs). The main features of harmonic spectrum from SBEs agree well with the result of the time-dependent Schroodinger equation(TDSE), and the cut-off energy can be precisely estimated by the recollision model. With increasing the field strength, the harmonic spectrum shows an extra plateau. Based on the temporal population of electron and the time–frequency analysis, the harmonics in the extra plateau are generated by the Bloch oscillation. Due to the ultrafast time response of the Bloch electron, the generated harmonics provide a potential source of shorter isolated attosecond pulse.

关 键 词：high-order harmonic generation attosecond pulse semiconductor Bloch equations time-dependent Schrodinger equation 

分 类 号：O17[理学—数学]