中国物理B ›› 2010, Vol. 19 ›› Issue (8): 83203-083203.doi: 10.1088/1674-1056/19/8/083203

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

李钱光1, 王少义2, 洪伟毅2, 张庆斌2, 陆培祥2   

  1. (1)School of Physics and Electronic-Information Engineering, Xiaogan College, Xiaogan 432000, China; (2)Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 收稿日期:2009-06-01 修回日期:2009-12-31 出版日期:2010-08-15 发布日期:2010-08-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10774054), and the National Key Basic Research Special Foundation of China (NKBRSFC) (Grant No. 2006CB806006).

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

Wang Shao-Yi(王少义)a), Hong Wei-Yi(洪伟毅)a), Zhang Qing-Bin(张庆斌)a), Li Qian-Guang(李钱光)b), and Lu Pei-Xiang(陆培祥)a)†   

  1. a Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China; b School of Physics and Electronic-Information Engineering, Xiaogan College, Xiaogan 432000, China
  • Received:2009-06-01 Revised:2009-12-31 Online:2010-08-15 Published:2010-08-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10774054), and 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 = e2E02 /(4meω2) 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.

Abstract: 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 = e2E02 /(4meω2) 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.

Key words: attosecond manipulation, attosecond pulse, supercontinuum generation

中图分类号:  (Autoionization, photoionization, and photodetachment)

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