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Self-focusing up to the incident laser wavelength by an appropriate density ramp

Published online by Cambridge University Press:  15 December 2011

R. Sadighi-Bonabi*
Department of Physics, Sharif University of Technology, Tehran, Iran
M. Moshkelgosha
Department of Physics, Sharif University of Technology, Tehran, Iran
Address correspondence and reprint requests to: R. Sadighi-Bonabi, Department of Physics, Sharif University of Technology, 11365-9161, Tehran, Iran. E-mail:


This work is devoted to improving relativistic self-focusing of intense laser beam in underdense unmagnetized plasma. New density profiles are introduced to achieve beam width parameter up to the wavelength of the propagating laser. By investigating variations of the beam width parameter in presence of different density profiles it is found that the beam width parameter is considerably decreased for the introduced density ramp comparing with uniform density and earlier introduced density ramp profiles. By using this new density profile high intensity laser pulses are guided over several Rayleigh lengths with extremely small beam width parameter.

Research Article
Copyright © Cambridge University Press 2011

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