en تخصصي Special پژوهشي Research <p style="text-align: justify;">high harmonic generation is a useful tool for the generation of short, intense attosecond pulses. In order to simulate high harmonic generation, we performed a numerical solution to the time dependent Schr&ouml;dinger equation. by considering dipole approximation, we predicted generation of a 53 attosecond pulse. In order to see the time and frequency of emission of attosecond pulse, we exploit time frequency analysis. On the other hand, because of uncertainty between time and frequency, it would be of high importance whether which analysis is been applied. our studies show that Gabor analysis exhibits the least uncertainty between time and frequency components. And at least, we set the balance between time and frequency distribution by altering the window size. &nbsp;</p> Schrödinger equation, harmonic spectrum, isolated attosecond pulse, time frequency analysis. 57 68 http://ijop.ir/browse.php?a_code=A-10-561-1&slc_lang=en&sid=1 Forouq Hosseinzadeh forouq.hosseinzadeh@gmail.com 10031947532846002119 10031947532846002119 No University of Guilan Saeed Batebi s_batebi@guilan.ac.ir 10031947532846002120 10031947532846002120 Yes University of Guilan Mostafa Qadiri Soofi m_qadiri2005@gmail.com 10031947532846002121 10031947532846002121 No University of Guilan