TY - JOUR T1 - Numerical Simulation of an Intense Isolated Attosecond Pulse by a Chirped Two-Color Laser Field TT - JF - ijop JO - ijop VL - 6 IS - 1 UR - http://ijop.ir/article-1-94-en.html Y1 - 2012 SP - 3 EP - 12 KW - Attosecond pulse KW - High order harmonic generation (HHG) KW - Two color laser field Numerical Simulation of an Intense Isolated Attosecond Pulse by a Chirped Two-Color Laser FieldWe investigate theoretically the high-order harmonic spectrum extension and numeri N2 - We investigate theoretically the high-order harmonic spectrum extension and numerical generation of an intense isolated attosecond pulse from He+ ion irradiated by a two-color laser field. Our simulation results show that the chirp of the fundamental field can control HHG cutoff position. Also, these results show that the envelope forms of two fields are important factors for controlling the resultant attosecond pulses. Besides, the effects of relative intensity are investigated. As a result, by using the optimized conditions an intense isolated 126-as (attosecond) pulse can be observed M3 ER -