Tellurite And Fluorotellurite Glasses For Active And Passive

Loss / dB.m -1
6. Optical properties; MDO 203
It can be seen there was no lower wavenumber strongly H-bonded OH band for the
fluorotellurite glasses at around 2300 cm -1 , or it was enveloped by the multiphonon edge.
It can be seen that the OH absorption bands decrease significantly with increasing ZnF2
content. Fig. (6.27) illustrates this trend [5].
140
120
100
80
60
40
20
0
0 5 10 15 20 25 30 35
x ZnF2 / mol. %
Fig. (6.27): Variation of OH band height peak absorbance at 2900 cm -1 with increasing
ZnF2 content for glass series (90-x)TeO2-10Na2O-xZnF2, mol. %, for 5 ≤ x ≤ 30 mol. %
(glasses MOF001, 004 to 008, with background loss removed) [5].
It can be see that absorption due to the OH band decreased with increasing ZnF2 in the
glass, reaching a minimum of around 20 dB.m -1 for glasses containing > 15 mol. % ZnF2.
Fig. (6.28) shows the variation in this band with melting time for glass MOF001
(65TeO2-10Na2O-25ZnF2 mol. %).