Nonparaxial theory of cross-focusing of two laser beams and its effects on plasma wave excitation and particle acceleration: Relativistic case

Sharma, R. P.; Chauhan, P. K.
June 2008
Physics of Plasmas;Jun2008, Vol. 15 Issue 6, p063103
Academic Journal
Cross-focusing of two propagating ultrahigh power laser beams in homogeneous plasma (laser intensity IL>016 W/cm2) has been studied in the nonparaxial region. By expanding the eikonal and other relevant quantities up to the fourth power of r (radial distance), we observed that the focusing of the laser beams becomes fast in the nonparaxial region. The difference in focusing/defocusing of the axial and off-axial rays leads to the formation of a splitted profile of laser beams in the plasma. A remarkable change is also observed in the amplitude of plasma wave excitation and particle acceleration in the nonparaxial region in comparison to the paraxial region.


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