J4 ›› 2012, Vol. 29 ›› Issue (5): 530-535.

• Laser Tech. and Devices • Previous Articles     Next Articles

Broad bandwidth attosecond pulse generation using mid-infrared two color field to control quantum trajectory

LI Lin1, LUO Jiang-hua2   

  1. 1 College of Physical Science and Technology, Yangtze University, Jingzhou 434023, China;
    2 Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China
  • Received:2011-09-01 Revised:2011-11-07 Published:2012-09-28 Online:2012-09-02

Abstract:

A method to generate a broadband water window continuum high-order harmonic generation spectra is proposed using a few-cycle two-color driving pulse synthesized by 2000 nm mid-Infrared laser driving field and a its much weaker 1000 nm second harmonic modulation field. In our scheme, the ionization step can be modulated by the weaker second harmonic, which not only broadens the bandwidth but also enhances the yields of the continuum harmonics. By solving time-dependent SchrÖdinger equation based on one-dimensional helium atom model, it is found that a broadband continuum harmonic spectrum with bandwidth of 190 eV is observed and the yield of the continuum harmonics is increased by two order compared with one-color 2000 nm driving field alone. Furthermore, adjusting the carrier envelop phase between the two-color field can enhance the contribution of one ionization trajectories and simultaneously suppress the other one, from which we can obtain an isolated 70 as pulse.

Key words: X-ray optics, high-order harmonic generation, two-color field, continuum spectrum

CLC Number: 

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