Ultraviolet generation in a dual-periodic domain inverted structure in LiTaO3 crystal by frequency tripling a 1.064 μm laser

Abstract

We demonstrate a coupled optical parametric process that is able to realize in a dual-period domain inverted structure in complex quasi-phase-matched scheme. As an example, we designed and fabricated a dual-periodic domain inverted structure in LiTaO3 for the first time. This structure couples second-harmonic generation and sum-frequency generation through two cascade quasi-phase-matched processes, therefore, a direct third-harmonic generation can be realized. The test verified that ultraviolet was generated in the optical superlattice through frequency tripling a 1.064 μm laser.