Abstract

Second-harmonic generation (SHG) in optical waveguides enables the construction of a green- or blue-light source; the potential high-conversion efficiency should enable use of the laser diode as a fundamental light source. Quasi-phase matching (QPM), enabling use of the largest nonlinear coefficient (d₃₃) for any arbitrary fundamental wavelength, was recently demonstrated^1,2 using periodically domain-inverted lithium niobate (LiNbO₃) waveguides. However, the low optical-damage threshold of LiNbO₃ limited the output power of the second harmonic.

© 1991 Optical Society of America