A periodically domain-inverted structure for a first-order quasi-phase
matched second harmonic generation was fabricated in an X-cut MgO:LiNb
O3 crystal utilising 2D high-voltage application. Using this structure
with a proton-exchanged waveguide, a blue output power of 19mW at a w
avelength of 433nm was generated for a conversion efficiency of 600%/W
.