Second-harmonic generation by coalescence of two counterpropagating surface waves in a laser-produced plasma

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Abstract
A mechanism is proposed in which second-harmonic emission is generated due to the coalescence of two surface waves counterpropagating along the critical surface of a laser-produced plasma. The waves are resonantly excited by a laser beam focused upon the inhomogeneous plasma whose density profile is steepened in the vicinity of the critical density. The necessary condition for this mechanism to operate is, however, the presence of a dc magnetic field in the critical region.