Li-Qiang Feng, Yun-Bo Duan and Tian-Shu Chu Harmonic extension and attosecond pulse generation by using the modified three-color chirped pulse Annalen der Physik 525
Through numerical solution of the quasi-three-dimensional time-dependent Schrödinger equation, the harmonic spectra and attosecond-pulse generation have been theoretically investigated when a model He atom is exposed to the modified three-color chirped field (800 nm+1600 nm+1200 nm). It is found that when the chirp parameters are chosen to be β1 = 0.3 (corresponding to the 800-nm field), β2 = 0.6 (corresponding to the 1600-nm field) and β3 = −0.2 (corresponding to the 1200-nm field), the harmonics have an optimal extension resulting in a 491 eV bandwidth. Further, an isolated 32-as pulse is directly achieved with proper harmonic superposition.
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