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Proceedings Paper

Optical transition properties of rare-earth ions in nonfluoride halide glasses
Author(s): Masanori Shojiya; Kohei Kadono; Masahide Takahashi; Ryoji Kanno; Yoji Kawamoto
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Paper Abstract

Optical transition properties of Er3+ ions in ZnCl2-KCl-BaCl2 glass were studied and were discussed on the comparison with those in the other glass systems, i.e., ZrF4-based and Ga2S3-based glasses. Judd-Ofelt analysis was performed using eight absorption bands of Er3+ in the ZnCl2-based glass. Among the Judd- Ofelt intensity parameters, the (Omega) 2 was larger than that of the ZrF4-based glass. This is probably due to the covalency of the bonds of the rare-earth and ligand ions in comparison with those of the ZrF4-based glass. Decay curves of the emission from the 4F5/2, 4F7/2, 4S3/2, and 4F9/2 levels were measured. From the lifetime data and the radiative transition probabilities calculated using the Judd-Ofelt intensity parameters, multiphonon relaxation rates are estimated for the four excited levels. The multiphonon relaxation rates of the 4F5/2, 4F7/2, and 4F9/2 were much smaller than those in the ZrF4- based and Ga2S3-based glasses. This is the consequence of the extremely low-phonon-energy property of the ZnCl2-based glass. The multiphonon relaxation rates were inversely proportional to the exponential of the energy gap between the emission and the next-lower levels (a so- called `energy-gap low') as well as the other glass systems.

Paper Details

Date Published: 15 April 1998
PDF: 8 pages
Proc. SPIE 3280, Rare-Earth-Doped Devices II, (15 April 1998); doi: 10.1117/12.305403
Show Author Affiliations
Masanori Shojiya, Kobe Univ. (Japan)
Kohei Kadono, Osaka National Research Institute (Japan)
Masahide Takahashi, Kobe Univ. (Japan)
Ryoji Kanno, Kobe Univ. (Japan)
Yoji Kawamoto, Kobe Univ. (Japan)

Published in SPIE Proceedings Vol. 3280:
Rare-Earth-Doped Devices II
Seppo Honkanen; Shibin Jiang, Editor(s)

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