Second-harmonic generation of blue light in LiNbO3 crystal with periodic ferroelectric domain structures

Abstract
A LiNbO3 crystal with periodic laminar ferroelectric domain structures (460 domains) was used to generate 430 and 435 nm radiation by quasi‐phase‐matched frequency doubling at room temperature. Blue light output of 0.2 μJ energy was measured for input energy 5 μJ of fundamental wave in pulse operation.