Phase-matched relativistic second harmonic generation in clusters with density ripple

摘要

An intense short-pulse laser obliquely incident on a clustered gas quickly converts the atomic clusters into hot plasma balls. The laser beam produces a second harmonic due to nonlinear response of cluster and plasma electrons. For enhancement of efficiency of second harmonic generation, there should be appropriate phase-matching between the incident laser beam and the generated harmonic. To achieve the required phase-matching, the ripple in cluster density and plasma electron density outside the cluster is introduce. The efficiency of second harmonic generation is sensitive to the angle between ripple wave vector (k(0)) over right arrow and the direction of the incident laser beam. (C) 2016 Elsevier BY. All rights reserved.