Second-order quasi-phase-matched blue light generation in a bulk periodically poled LiTaO₃

Domain reversal in LiTaO 3 with period 6.5 mu m and 1:3 duty cycle has been obtained by using a partially switching technique in a 0.25 mm thick sample. A CW second-order quasi-phase-matched second-harmonic-generation experiment yielded a 12 mu W, 407 nm blue light output for 200 mW, 814 nm fundamental input. The technique can be used for the fabrication of the periodic poled LiTaO 3 for bulk violet and ultraviolet second-harmonic generation and for the fabrication of other ferroelectric microstructure materials.