Quasi-phase matched third harmonic generation

Abstract

Quasi-phase matched third harmonic generation has been demonstrated using a simple silica structure of six modulation periods. Like the quadratic quasi-phase matched structures based on lithium niobate, this structure is limited in performance primarily by the tolerance necessary in the thickness of the individual layers in the structure. With suitable development such a device might become a practical and inexpensive alternative source of blue or near ultraviolet radiation based on common pulsed near infra-red solid state lasers.