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A planar optical waveguide in erbium-doped NaY(WO 4 ) 2 crystal was formed by 2.6 MeV He + ions with dose of 1.5x10 16 ions/cm 2 at room temperature. The dark modes were measured using the prism coupling technique. Four TE modes and five TM modes were observed in the waveguide. The refractive index profiles were analyzed using the reflectivity calculation...
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