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

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.