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Rb/Ba side-diffused ridge waveguides in KTP.
Optics Express 2017 August 22
We report on characterization of ridge waveguides fabricated in KTP (KTiOPO4 ) by use of diamond-blade dicing and Rb/Ba ion exchange. The waveguides were prepared in substrates that have their z-axis in the surface plane, perpendicular to the waveguide direction. This hinders the RbBa ions from diffusion into the depth, as they are only mobile along the z-axis, and improves the waveguide's resistance against elevated temperature. Attenuation coefficients of 0.3 dB/cm (0.4 dB/cm) for TM (TE) polarization were measured at 1060 nm wavelength. Internal conversion efficiency of up to 3.3%/(W cm2 ) was determined for type-II SHG of 1064 nm.
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