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Enhancement of the 1.31-μm emission properties of Dy3+-doped Ge–Ga–S glasses with the addition of alkali halides

Published online by Cambridge University Press:  31 January 2011

Yong Beom Shin ,
Jong Heo  and
Hyoun Soo Kim
Yong Beom Shin
Affiliation:
Bio-Information Sensing Team/Human Information Technology Department, Telecommunication Basic Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), 161 Kajong-Dong, Yusong-Gu, Taejun, 305-350, South Korea
Jong Heo
Affiliation:
Photonic Glasses Laboratory, Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea
Hyoun Soo Kim
Affiliation:
Applied Optics R&D Group, Samsung Electronics Co. Ltd., Suwon, 440–600, Korea
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Abstract

Alkali halides such as KBr, KI, CsBr, and CsI were added to Dy3+-doped Ge–Ga–S glasses, and their effects on the 1.31-μm emission property were investigated. The intensities of the 1.31-μm emission (6F11/2 · 6H9/2 → 6H15/2) increased at the expense of the 1.75-μm emission intensity (6H11/2 → 6H15/2) with the alkali halide addition. The lifetimes of the 1.31-μm emission level also increased as much as 35 times from 38 μs for Ge–Ga–S glass to 1320 μs for the glass containing 10 mol% CsBr. These enhancements occurred only when the ratio of MX (M = K, Cs; X = Br, I)/Ga was equal to or larger than unity. Raman spectra of Ge–Ga–S–CsBr glasses indicated the formation of [GaS3/2Br]− complexes, which provide the preferred sites for Dy3+. Due to this new local environment of Dy3+, the multiphonon relaxation rates from the Dy3+:6F11/2 · 6H9/2 level decreased by approximately four orders of magnitude. The enhancement in the 1.31-μm emission properties with alkali halide addition supports the potentials of these glasses as hosts for the Dy3+-doped fiber-optic amplifiers.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1318 - 1324
Copyright
Copyright © Materials Research Society 2001

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