Isolated sub-50 attosecond pulse generation driven by tricolor multi-cycle pulses

Abstract

We theoretically investigate the high-order harmonic generation (HHG) driven by laser pulses with tri-color carrier wave in the multi-cycle regime. Through the modulation of the carrier wave, the peak of the return kinetic energy of the electron near the pulse center extends dramatically and the other peaks are suppressed by the envelope. Thus, a very broad continuum spectrum appears in the HHG. Moreover, due to the propagation effect, the long path of the electron for the continuum spectrum is eliminated effectively. Hence, the continuum spectrum is well-phase locked, from which an isolated sub-50 attosecond pulse could be obtained even for the driver pulse with duration of 30 fs.

Keywords:

• high-order harmonic generation
• attosecond pulse
• propagation effect

Acknowledgements

This work is supported by the National Basic Research Program of China (Grant Nos. 61308029 and 51174263), and the Doctor Fund (Grant No. B2011-076) of and the High-Performance Grid Computing Platform of Henan Polytechnic University.

Additional information

Funding

This work is supported by the National Basic Research Program of China [grant number 61308029] and [grant number 51174263]; and the Doctor Fund [grant number B2011-076] of and the High-Performance Grid Computing Platform of Henan Polytechnic University.