Helium ion implanted optical waveguide in KTiOPO4

The first ion implanted optical waveguide in the nonlinear material KTP is reported. The refractive index profiles are characterised for both n_x and n_z, and the loss is examined after an annealing. The index changes ( approximately 0% in the electronic interaction region and approximately 4% decrease in the nuclear stopping region) show that a typical barrier waveguide is formed in the implanted KTP. The tuning wavelength ranges for type 2 zero mode phase matching SHG in ion implanted waveguides as a function of guide widths are calculated for different propagating angles.