HIGH-EFFICIENCY LINBO3 WAVE-GUIDE 2ND-HARMONIC GENERATION DEVICES WITH FERROELECTRIC-DOMAIN-INVERTED GRATINGS FABRICATED BY APPLYING VOLTAGE

The characteristics of the ferroelectric-domain-fabricated inverted gr atings fabricated by applying voltage at room temperature in Z-cut LiN bO3 crystal were examined for waveguide quasiphase-matched second-harm onic generation (QPM-SHG) devices, Conditions suitable for reproducibl e fabrication of uniform grating structure were clarified, Devices wit h uniform and fan-out grating for green and blue light generation were fabricated, and the performances were examined, A normalized SHG effi ciency as high as 150%/W was obtained in blue light generation device with uniform grating of 3 mm interaction length.