Ultraviolet Second Harmonic Generation in ß-BaB 2 O 4 Waveguides

Continuous-wave UV laser light at 278 nm has been generated by optical second harmonic generation (SHG) in beta-BaB 2 O 4 waveguides produced by He+ ion implantation. The production of ridge waveguides in this material is reported together with the waveguides properties. SHG conversion efficiency of 0.1 %W~1 has been demonstrated at 278 nm.