Efficient frequency doubling and locking of diode laser light in periodically segmented KTiOPO4 waveguide

Abstract
Simultaneous frequency doubling and Bragg reflection locking of the light of a GaAlAs diode laser was obtained by two separate sections of a periodically segmented waveguide of KTiOPO4. A blue light power of 3.6 mW at 429 nm was generated. The blue light was emitted in a circular beam with a low divergence angle of 5.7°.