| 摘要 |
PURPOSE:To provide the process for production of the optical waveguide which lessens light propagation loss and facilitates the control of light. CONSTITUTION:The substrate 1 is composed of a direct compd. of rare earths contg. Li as one of constituting elements and the Li is partly substd. with proton ions in a part of the substrate 1, by which the optical waveguide is formed. As a result, the defects occurring in mismatching of the crystal lattice are eliminated and the highly refractive region, i.e., the optical waveguide, is formed in the state of maintaining the good-quality crystallinity of the substrate. In addition, the shape control of the optical waveguide is easily and precisely executed and the reproducibility is excellent. |
