Attosecond manipulation of ionization and efficient broadband supercontinuum generation in stretched molecules  

作　　者：王少义 洪伟毅 张庆斌 李钱光 陆培祥 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology [2]School of Physics and Electronic-Information Engineering,Xiaogan College

出　　处：《Chinese Physics B》2010年第8期318-324,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.10774054);the National Key Basic Research Special Foundation of China(NKBRSFC)(Grant No.2006CB806006)

摘　　要：We theoretically investigate the high-order harmonic generation from stretched molecules in a linearly polarized intense field. By adopting an infrared pulse combined with an ultraviolet （UV） attosecond pulse, the ionization process can be controlled effectively. In this excitation scheme, the harmonic spectrum beyond Ip ＋ 3.17Up is significantly enhanced by two orders, where Ip and Up = e^2E0^2/（4mew^2） are the ionization and ponderomotive potential, then smooth broadband supercontinuum with the bandwidth of about 120 eV is obtained, which leads to an isolated sub-60- as attosecond pulse with a high signal-noise ratio. Moreover, the bandwidth of the supercontinuum is weakly dependent on the location and pulse duration of the UV pulse.We theoretically investigate the high-order harmonic generation from stretched molecules in a linearly polarized intense field. By adopting an infrared pulse combined with an ultraviolet （UV） attosecond pulse, the ionization process can be controlled effectively. In this excitation scheme, the harmonic spectrum beyond Ip ＋ 3.17Up is significantly enhanced by two orders, where Ip and Up = e^2E0^2/（4mew^2） are the ionization and ponderomotive potential, then smooth broadband supercontinuum with the bandwidth of about 120 eV is obtained, which leads to an isolated sub-60- as attosecond pulse with a high signal-noise ratio. Moreover, the bandwidth of the supercontinuum is weakly dependent on the location and pulse duration of the UV pulse.

关 键 词：attosecond manipulation attosecond pulse supercontinuum generation 

分 类 号：O561[理学—原子与分子物理]