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Abstract- in order to achieve a short attosecond pulse in this article ,we solved the time dependent 1D Schrodinger equation for a single helium atom. By calculating the modulus squared of Fourier transformation of the induced dipole acceleration, we succeed to depict the spectrum of high harmonics for one-color , two-color and three –color laser field . By superposing several harmonics near the cutoff region, in the three-color laser field the isolated attosecond pulse is generated. In the following ,we considered the effects of different pulse shapes. With the use of the best one (sine squared) we succeeded to generate an isolated (79) attosecond pulse.
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