Shixun DAI
,
Junjie ZHANG
,
Shunguang LI
,
Jianhu YANG
,
Shiqing XU
,
Guonian WANG
,
Lili HU
材料科学技术（英）
1 wt pct Nd2O3-doped tellurite bulk glass and fiber with the same composition of 75TeO2-15ZnO-5Na2O-5Li2O (mol fraction, %) were fabricated. Judd-Ofelt analysis was carried out for the bulk. The emission from the 4F3/2→4I13/2 transition in fiber is at 1.33μm wavelength with a spectral bandwidth of 55 nm, which is similar to that in bulk. In the case of the fiber, the lifetime of 4F3/2 level is 164μs, and the quantum efficiency is ~100%. The figure-of-merit for gain (σpτ0) for Nd3+-doped tellurite glass is about 2.8×10-24 cm2•s, which is quite comparable with that in Nd3+-doped fluoroaluminate glasses, and is an order of magnitude larger than Pr3+-doped fluoride glasses.
关键词:
Tellurite glass
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Junjie ZHANG
,
Shixun DAI
,
Shiqing XU
,
Guonian WANG
,
Liyan ZHANG
,
Lili HU
材料科学技术（英）
In this work, a new TeO2-BaO-BaF2-La2O3-LaF3 oxyfluorotellurite glass system is investigated. Differential thermal analysis (DTA) and structural analysis by Raman scattering spectra are reported on the glasses. The DTA results indicated that an increase of fluoride content in the glasses decreases the glass transition temperature (Tg) and increases the crystallization onset temperature (Tx). As a result the 70TeO2•20BaF2•10LaF3 glass showed a large Hruby's parameter, possessing excellent thermal stability. Changes in glass network structure with fluoride content are discussed based on the Raman scattering spectra of glasses. The glass network structures in the 70TeO2• (20-x)BaO•xBaF2• (10-y)La2O3•yLaF3 glasses are basically composed of both Te(O, F)4 and Te(O, F)3 units, but the Te(O, F)4/Te(O, F)3 ratio in the glass becomes higher with increasing fluoride content. This may be considered one of the reasons why the 70TeO2•20BaF2•10LaF3 glass exhibits excellent thermal stability.
关键词:
Raman spectrum
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