A high-power waveguide resonator second harmonic device with external conversion efficiency up to 75%

摘要

We report on a highly efficient waveguide resonator device for the productionof 775 nm light using a titanium indiffused LiNbO3waveguide resonator. Whenscanning the resonance the device produces up to 110 mW of second harmonicpower with 140 mW incident on the device - an external conversion efficiency of75 %. The cavity length is also locked, using a Pound-Drever-Hall type lockingscheme, involving feedback to either the cavity temperature or the laserfrequency. With laser frequency feedback a stable output power of approximately28 mW from a 52 mW pump is seen over one hour.