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Control of the high-order harmonic cutoff and attosecond pulse generation through the combination of a chirped fundamental laser and a subharmonic laser field, Wu, Zhang, Xia, Liu*, Phys. Rev. A, (2010), 013411. FIG. 4. (Color online) (a) Harmonic spectra of the He+ ion generated by synthesizing the chirped fundamental laser field (β = 0.65) and the subharmonic laser field. (b) The corresponding time frequency distribution of the HHG spectrum in (a) (the solid red curve). o.c. denotes optical cycle. Control of the high-order harmonic cutoff and attosecond pulse generation through the combination of a chirped fundamental laser and a subharmonic laser field, Wu, Zhang, Xia, Liu*, Phys. Rev. A, (2010), 013411. FIG. 5. The temporal profiles of the as pulses in the synthesized chirped fundamental laser field (β = 0.65) and the subharmonic laser field. (a) as pulse by superposing harmonics from the 250th order to the 1300th order. (b) as pulse by superposing harmonics from the 1200th order to the 1250th order. (c) as pulse by superposing harmonics from the 250th order to the 300th order. (d) as pulse by superposing harmonics from the 350th order to the 420th order. o.c. denotes optical cycle. FIG. 7. (Color online) (a) Electric-field strength of the two-color laser field with the chirped parameter (β = 0.65). (b) The corresponding dependence of the harmonic order on the ionization time (the blue trigonal curve) and the emission time (the red circular curve). o.c. denotes optical cycle. Single attosecond pulse generation in an orthogonally polarized two-color laser field combined with a static electric field, Xia, Zhang, Wu, and Liu, Phys. Rev. A, 81(2010), 043420. FIG. 2. (Color online) High-order harmonic spectra produced in an orthogonally polarized two-color laser field with different intensiti
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