Abstract
We theoretically propose a new method for generating intense isolated
attosecond pulses during high-order harmonic generation (HHG) process by accurately
controlling electron motion with a two-color laser field, which consists of an
800-nm, 4-fs elliptically polarized laser field and a 1400-nm, ~43-fs linearly
polarized laser field. With this method, the supercontinua with a spectral width
above 200 eV are obtained, which can support a ~15-as isolated pulse after phase
compensation. Classical and quantum analyses explain the controlling effects well.
In particular, when the pulse duration of the 800-nm laser field increases to 20-fs,
sub-100-as isolated pulses can be obtained even without any phase compensation.
© 2011 Chinese Optics Letters
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