Tellurite And Fluorotellurite Glasses For Active And Passive

9. Conclusions; MDO 391
manufacture, durability, low Tg, high refractive index (for high power and non-linear
applications) and low OH content. However, the nature of the structural units and
hydrogen bonding in these oxyfluoride glasses should be investigated further to provide a
more detailed understanding of structure-property relationships in these systems.
Identification of products of volatilisation during melting should also be performed (e.g.
by TGA-mass spectrometry [15]) as the melt composition on casting determines
properties and is an important consideration for glass formation.
Losses in these fibres must be reduced below 1 dB.m -1 in the near- and mid-infrared
regions (around 700 nm to 5 µm) for short path length applications such as sensors (e.g.
military threat detection) and power delivery (e.g. surgical lasers). Double fluorination,
reactive atmosphere processing (RAP) and batching / melting inside a glovebox are a
number of possible routes for reducing extrinsic impurities, particularly hydroxyl groups,
in fluorotellurite glasses and optical fibres.
9.7. References
[1] J. W. Zwanziger, J. C. McLaughlin, and S. L. Tagg, "Sodium distribution in
sodium tellurite glasses probed with spin-echo NMR," Physical Review B, vol. 56,
pp. 5243-5249, 1997.
[2] J. C. McLaughlin, S. L. Tagg, and J. W. Zwanziger, "The structure of alkali
tellurite glasses," Journal of Physical Chemistry B, vol. 105, pp. 67-75, 2001.
[3] J. C. McLaughlin, S. L. Tagg, J. W. Zwanziger, D. R. Haeffner, and S. D. Shastri,
"The structure of tellurite glass: a combined NMR, neutron diffraction, and X-ray
diffraction study," Journal of Non-Crystalline Solids, vol. 274, pp. 1-8, 2000.
[4] K. Aida, T. Komatsu, and V. Dimitrov, "Thermal stability, electronic
polarisability and optical basicity of ternary tellurite glasses," Physics and
Chemistry of Glasses, vol. 42, pp. 103-111, 2001.