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unmagnetized plasma

Laser and Particle Beams (1)

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Self-focusing up to the incident laser wavelength by an appropriate density ramp
R. Sadighi-Bonabi, M. Moshkelgosha
Journal:

Laser and Particle Beams / Volume 29 / Issue 4 / December 2011

Published online by Cambridge University Press:

15 December 2011, pp. 453-458
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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.