In this paper we simulate the generation of an isolated attosecond pulse by solving the time dependent 1D Schrӧdinger equation for single Helium atom, and by using the one color, two color and three color laser field ,we generate the high harmonic spectrum and compare them with each other. Then by adding a linear phase compensation to the three color laser field and gaining the suitable phase control factor we investigate the best way to generate these ultra-short pulses in Helium atom. By superposing several harmonics in cut off vicinity, we obtain an isolated 76 attosecond pulse.
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