Optics and Photonics Society of Iran

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Zare S. The effect of laser wavelength in electron beam generated by laser-target interaction. ICOP & ICPET _ INPC _ ICOFS 2020; 27 (1) :52-54
URL: http://opsi.ir/article-1-2286-en.html

In this article, the interaction of two femtosecond laser pulses with same intensities and different wavelengths is compared. In the interaction of high power lasers with the plasma, the electrons are accelerated by ponderomotive force. Due to this force and the electrostatic force, the electrons oscillate in the laser propagation direction. In this work, the interaction is studied by GENUINE two-fluid hydrodynamic code. It is found that the electron velocity by the 1064nm laser is more than ten times higher than the electron velocity by the 800 nm laser. Furthermore, the electron current created by two lasers is compared. The electron beams generated by 1064nm wavelength have deep penetration in the plasma and they stay in maximum current density for more interaction time. Moreover, the comparison of the electron temperature shows that the maximum temperature of the electrons created by 1064nm is twice bigger than other pulse. Also, the electrons produced by 800nm wavelength, stay in the maximum value for a little time, so they almost are in the temperature equal to 25% of the electron temperature by 1064nm laser.