Journal
PHYSICAL REVIEW A
Volume 82, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.82.063838
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Funding
- National Natural Science Foundation of China [10974198, 20903094, 20833008, 50772018, 50402025]
- NKBRSF [2007CB815202, 2009CB220010]
- 863 Project [2006AA01A119, 2009AA01A130]
- Program for New Century Excellent Talents in University of China [NCET-07-0139]
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In the present work, laser-parameter effects on the isolated attosecond pulse generation from two-color high-order harmonic generation (HHG) process are theoretically investigated by use of a wave-packet dynamics method. A 6-fs, 800-nm, 6 x 10(14) W/cm(2), linearly polarized laser pulse serves as the fundamental driving pulse and parallel linearly polarized control pulses at 400 nm (second harmonic) and 1600 nm (half harmonic) are superimposed to create a two-color field. Of the two techniques, we demonstrate that using a half-harmonic control pulse with a large relative strength and zero phase shift relative to the fundamental pulse is a more promising way to generate the shortest attosecond pulses. As a consequence, an isolated 12-as pulse is obtained by Fourier transforming an ultrabroad xuv continuum of 300 eV in the HHG spectrum under half-harmonic control scheme when the relative strength root R = 0.6 and relative phase = 0.
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