Studies on Er2O3 and Yb2O3 Concentration Limit in Alumophosphorosilicate Glass

Abstract

This study determines the limiting concentrations of Er₂O₃ and Yb₂O₃ in aluminum-phosphorosilicate (APS) glass containing similar concentrations of aluminum and phosphorus, where the signal amplification in the lightguides is still possible. The structural group of AlPO₄ is evaluated as a codoping additive to quartz glass, which causes an increase in the concentration limit for the embedding (solubility) of the oxides of rare earth elements (REEs). The concentration ratios Er₂O₃/AlPO₄ and Yb₂O₃/AlPO₄ that provide a high amplification efficiency and a low level of optical loss in lightguides are determined.