Abstract

Highly efficient third harmonic generation (THG) at 355 nm from high-peak-power-pulsed Nd laser sources at 1064 nm has been previously reported.1,2 While these earlier experiments required a variety of special wave plates to appropriately recombine the fundamental and second harmonic to satisfy the THG phase match conditions, a simpler scheme has recently been proposed by Craxton.1 This so-called type II—type II technique relies on type II phase matching for both SHG and THG and requires no special wave plates between nonlinear crystals.

© 1984 Optical Society of America

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