US Patent 7844157 Optical waveguide for luminescent device and manufacturing method thereof

An optical waveguide for a luminescent device capable of efficiently leading light beams propagating through a core outwardly to cause light emission, and a manufacturing method thereof. The optical waveguide for a luminescent device includes an under cladding layer 2, a core 3 formed in a predetermined portion of a surface of the under cladding layer 2, and an over cladding layer 4 formed on the surface of the under cladding layer 2 so as to cover the core 3. The over cladding layer 4 includes holes 41 formed in a predetermined portion thereof and extending to the core 3. The holes 41 are filled with a coating material 5 having a refractive index not less than that of the above-mentioned core 3.