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Optical transitions and frequency upconversion emission of Er3+ ions in Ga2S3–GeS2–La2S3 glasses

Optical transitions and frequency upconversion emission of Er3+ ions in Ga2S3–GeS2–La2S3 glasses

Authors :
K. Kadono
Naoyuki Kitamura
H. Higuchi
Yoji Kawamoto
Masahide Takahashi
T. Ohtsuki
N. Peyghambarian
Source :
Journal of Applied Physics. 83:19-27
Publication Year :
1998
Publisher :
AIP Publishing, 1998.

Abstract

Spectroscopic properties of Er3+ in Ga2S3–GeS2–La2S3 glasses are investigated on the basis of the spontaneous emission probabilities calculated by the use of the Judd–Ofelt theory and lifetime data. Frequency upconversion spectra are also measured with excitation at 800 and 980 nm. The spontaneous emission probabilities are much larger than those of the other glass systems such as oxides and fluorides. This is mainly attributed to the large refractive indices of the sulfide glasses. The quantum efficiencies of 4I11/2 and 4F9/2 levels are comparable or larger than the typical values of Er3+ in a fluoride glass. This is a consequence of the large spontaneous emission probabilities and low phonon energies of the sulfide glasses. However, the quantum efficiency of the 4S3/2 level is less than one-half of the value in the fluoride glass. The nonradiative transition probability of the 4S3/2 level is much larger than the value which is evaluated from the multiphonon relaxation theory. This suggests the presence ...

Details

ISSN :
10897550 and 00218979
Volume :
83
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........19fd4aad3b1e2b4f3f7605d584e723e8
Full Text :
https://doi.org/10.1063/1.366696