High efficiency quasi-phasematched frequency doubling waveguides in KTiOPO₄ fabricated by electric field poling

Waveguides for quasi-phasematched frequency doubling were fabricated using an applied electric field to produce periodic poling and ion-exchange to produce channel waveguides. A blue output power of 12mW was achieved with 146mW of infrared light in a 3.6mm-long waveguide.