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Planar waveguides were fabricated in nonlinear crystal KTiOAsO 4 by the implantation of 2.6 MeV He + ions (at a dose of 2x10 16 ions/cm 2 ) or 3.0 MeV Si + ions (at a dose of 2x10 15 ions/cm 2 ) at room temperature. The prism-coupling method was carried out to measure the dark modes in the waveguides and reflectivity calculation method...
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