53.
Er
3+-doped tellurite glasses with molar compositions of
xNb
2O
5-(14.7-x)Na
2O--10ZnO--5K
2O--10GeO
2--
60TeO
2--0.3Er
2O
3
(x=0, 3, 5, 7 and 9) have been investigated for developing 1.5~μm
fibre and planar amplifiers. The effects of Nb
2O
5 on the thermal stability
and optical properties of Er
3+-doped tellurite glasses have been discussed.
It is noted that the incorporation of Nb
2O
5 (x=5) increases the thermal
stability of tellurite glasses significantly. Er
3+-doped niobium tellurite
glasses exhibit a large stimulated emission cross-section (7.2\times 10
-21-
10.7×10
-21~cm
2 and the gain bandwidth, FWHM×\sigma
e^{\rm peak} (274\times 10
-28 - 480×10
-28~cm
3), which are
significantly higher than that of silicate and phosphate glasses. In addition, the
intensity of upconversion luminescence of the Er
3+-doped niobium tellurite
glasses decreases rapidly with increasing Nb
2O
5 content. As a result,
Er
3+-doped niobium tellurite glasses might be a potential candidate for
developing laser or optical amplifier devices.
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