中国物理B ›› 2012, Vol. 21 ›› Issue (3): 33202-033202.doi: 10.1088/1674-1056/21/3/033202

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

罗老永,杜洪川,胡碧涛   

  • 收稿日期:2011-05-17 修回日期:2011-07-23 出版日期:2012-02-15 发布日期:2012-02-15
  • 通讯作者: 胡碧涛,hubt@lzu.edu.cn E-mail:hubt@lzu.edu.cn

High-order harmonic generation with a two-color laser pulse

Luo Lao-Yong(罗老永), Du Hong-Chuan(杜洪川), and Hu Bi-Tao(胡碧涛)   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2011-05-17 Revised:2011-07-23 Online:2012-02-15 Published:2012-02-15
  • Contact: Hu Bi-Tao,hubt@lzu.edu.cn E-mail:hubt@lzu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11075069, 91026021, and 11075068), the Fundamental Research Funds for the Central Universities, China (Grant No. lzujbky-2010-k08), and the Scholarship Award for Excellent Doctoral Student granted by the Ministry of Education, China.

Abstract: We theoretically investigate the electron dynamics of the high-order harmonics generation process by combining a near-infrared 800 nm driving pulse with a mid-infrared 2000 nm control field. We also investigate the emission time of harmonics using time-frequency analysis to illustrate the physical mechanisms of high-order harmonic generation. We calculate the ionization rate using the Ammosov-Delone-Krainov model and interpret the variations in harmonic intensity for different control field strengths and delays. We find that the width of the harmonic plateau can be extended when the control electric field is added, and a supercontinuum from 198 to 435 eV is generated, from which an isolated 61-as pulse can be directly obtained.

Key words: high-order harmonic generation, attosecond pulse

中图分类号:  (Multiphoton ionization and excitation to highly excited states)

  • 32.80.Rm
42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)