Quantum wavepacket exploration of isolated high-order harmonic attosecond pulse generation: from two-color scheme to three-color scheme

Abstract

Isolated attosecond generation under the two-color scheme and three-color scheme are investigated theoretically by use of wave-packet dynamics calculation. Optimized relative phase under the two-color field is obtained and comparison is taken between the second-harmonic control and half-harmonic control. A further exploration of the three-color scheme by adding a weak second-harmonic pulse and a half-harmonic pulse onto 8×10¹⁴ W cm⁻² 6 fs/800 nm pulse shows the potential for generating the 337 eV continuum supporting creation of an isolated 11 as pulse.

Keywords:

• attosecond pulse generation
• high-order harmonic generation
• two-color scheme
• three-color scheme
• wave-packet dynamics

Acknowledgements

This work was supported by NSFC (Grant Nos. 10974198, 20903094 and 20833008) and NKBRSF (Grant Nos. 2007CB815202 and 2009CB220010) and 863 project (Grant Nos. 2006AA01A119 and 2009AA01A130). The authors sincerely thank Prof. Keli Han and Dr Ruifeng Lu for providing us the LZH-DICP code.