2ND-HARMONIC GENERATION OF BLUE-LIGHT IN BULK PERIODICALLY POLED LITAO3

We fabricated a periodic domain structure in a 0.5 mm thick slab of Li TaO3 crystal by applying an external pulsed field at room temperature. Using a pulse dye laser with a pulsewidth of 8 ns and a repetition ra te of 10 Hz, third-order quasi-phase-matched second-harmonic blue-ligh t generation is demonstrated by free propagation of a 862.6 nm fundame ntal Gaussian beam in a 4 mm long LiTaO3 slab, with a single pulse ene rgy of 0.072 mi and an energy conversion efficiency of 5.7%. (C) 1995 American Institute of Physics.