Abstract
This paper presents an investigation of laser guiding through an axially nonuniform collisionless plasma channel formed by the ionizing laser prepulse. When a delayed second laser beam is allowed to propagate through such preformed plasma channel, on account of nonuniform intensity distribution of laser beam, ponderomotive force comes into play, which further enhances the plasma channel. Unbalanced diffraction and refraction phenomenon through such an axially nonuniform collisionless plasma channel results in periodic beam width variation with the distance of propagation. Wave equations governing the propagation characteristics of the ionizing pre-pulse and delayed pulse through axially nonuniform collisionless plasma channel have been solved by moment theory approach. Effects of the axial nonuniformity and second delayed pulse intensity on the laser guidance have been studied.
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