GLASS WAVEGUIDE ADDED WITH RARE EARTH ELEMENT AND PRODUCTION THEREOF AND GLASS WAVEGUIDE LASER AND DEVICE USING THIS WAVEGUIDE

摘要

PURPOSE:To attain a smaller size, smaller loss and multipler functions by constituting a core waveguide of a hybrid film composed of fine particles of SiO2 and fine particles contg. rare earth elements. CONSTITUTION:A low-refractive index glass film 2 is formed on a substrate 1 consisting of LiNbO3, etc., and the core waveguide 3 is formed of the hybrid film consisting of the fine particles of the SiO2 contg. at least one kind of additives for refractive index control, such as B and F, and the fine particles contg. at least one kind of the rare earth elements, such as Er and Nd. The amt. of the rare earth elements to be added can be extremely increased to a range from several thousands ppm to several % and the controllability thereof is good. The smaller size, the smaller loss and the multiplier functions are attained in this way.