Abstract
In recent years, Er3+ -doped glasses with a broad 1.5 μm emission band originating from 4I13/ 2-4I15/2 transition of Er3+ have been extensively investigated for use in erbium-doped fiber amplifiers (ED-FA). Among the reported materials, Er3+ -doped telluride glasses exhibited a wide 1.5 μm emission band and a large stimulated emission section and high 1.5 μm emission efficiency. However, as a host for EDFA, telluride glass has some major drawbacks. One of them is the phonon energy of the glass is about 770 cm-1, which leads to the 4I11/ 2-4I13/2 nonradiative relaxation rate too slow to allow efficient pumping at 980 nm. To overcome this drawback, S. Shen et al. added WO3, with vibronic energy of W-O bond of 920 cm-1, into the glass to form tungsten-tellurite glasses. This composition modification increased the nonradiative relaxation rate of the 4I11/2 transition and made improvement of population feeding efficiency of 4I13/2 from the 4I11/2 level pumped at 980 nm. In this paper, P2O5 was introduced into Er3+ -doped tungsten-tellurite glasses. Emission, absorption and upconversion spectra of the glasses are studied. It is observed that the nonradiative relaxation rate of 4I11/2 transitions and the 1.5 μm emission efficiency increases with the increase of P2O5 content, while, the upconversion luminescence was suppressed. The nonradiative relaxation rate of 4I11/ 2-4I13/2 transition in a glass with 6% P2O5 is about 3.5 times greater than that without P2O5. The present results indicate that telluride glasses with P2O5 addition may be a promising candidate medium for broadband erbium-doped fiber amplifiers with good performance under the pumping of 980 nm.
Original language | English |
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Pages (from-to) | 274-278 |
Number of pages | 5 |
Journal | Chinese Journal of Luminescence |
Volume | 29 |
Issue number | 2 |
State | Published - Apr 2008 |
Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Radiation
- Condensed Matter Physics
Keywords
- Nonradiative decay
- Optical material
- PO
- Tungsten-telluride glasses