use of glasses containing rare earth oxides, alumina and zirconia and bond in optical wellenleitern

摘要

The invention provides optical waveguides comprising a glass doped with a rare earth dopant on a surface of the substrate, wherein the glass comprises (a) Al₂O₃, at least one of REO or Y₂O₃, and at least one of ZrO₂ or HfO₂, wherein at least 80 percent by weight of the glass collectively comprises the Al₂O₃, at least one of REO or Y₂O₃, and at least one of ZrO₂ or HfO₂, based on the total weight of the glass; (b) Al₂O₃, at least one of REO or Y₂O₃, and at least one of ZrO₂ or HfO₂, wherein at least 70 percent by weight of the glass collectively comprises the Al₂O₃, at least one of REO or Y₂O₃, and at least one of ZrO₂ or HfO₂, and wherein the glass contains not more than 20 percent by weight SiO₂ and not more than 20 percent by weight B₂O₃, based on the total weight of the glass; or (c) at least 40 percent by weight Al₂O₃, based on the total weight of the glass, and a first metal oxide other than Al₂O₃, wherein the Al₂O₃ and the first metal oxide, collectively comprise at least 80 percent by weight of the glass.