*Regular Paper*

[OPTICAL REVIEW Vol. 21, No. 5 (2014) 475-478]

© 2014 The Japan Society of Applied Physics

## Effect of Nonlinear Chirped Gaussian Laser Pulse Parameters on the Electron Acceleration

**Saeedeh AFHAMI and Esmaeil ESLAMI**^{*}

*Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran*

(Received April 16, 2014; Accepted July 23, 2014)

**One-dimensional analysis of electron acceleration by a nonlinear chirped Gaussian laser pulse was investigated numerically. Two main nonlinear chirped pulses, polynomial and periodical were used. The maximum energy of electron in nonlinear chirped is approximately three times more than that of linear chirped. In the case of first order nonlinear polynomial chirp, Ω (ξ ) = 1 + ***a*ξ + *b*ξ^{2}, the electron can be accelerated up to 5.3 GeV. Indeed, the analysis of the electron trajectory in *x*–*z* plane showed that the electron in the field of the nonlinear chirped pulse has a much smaller divergence than that of linear chirped pulse.

Key words: chirped laser pulse, nonlinear effect, electron acceleration, laser particle interaction

^{*}E-mail address: eeslami@iust.ac.ir