Optimization of Dy3+-doped Ge-Ga-As-S-CsBr glass composition and its 1.31 mu m emission properties

Abstract

An optimum glass composition for practical fiber fabrication was investigated for Ge-Ga-As-S-CsBr glasses. Dy3+ was doped into the glasses and its emission properties were examined. The best composition for practical use was 0.7[Ge0.25As0.1S0.65]-0.15GaS(3/2)-0.15CsBr. This glass also exhibited high resistance against the attack of liquid water. 0.7[Ge0.25As0.1S0.65]-0.15GaS(3/2) The lifetime and quantum efficiency of the 1.31 mum emission from Dy3+ increased approximately 17 and 4 times, respectively, compared to those obtained from other sulfide glasses. This is due to the formation of [GaS3/2Br](-) units. The frequency of the effective phonon which dominates the multiphonon relaxation process decreased from 375 to 245 cm(-1) with the addition of CsBr. (C) 2002 Elsevier Science B.V. All rights reserved.