Tellurite And Fluorotellurite Glasses For Active And Passive

6. Optical properties; MDO 185
CH3 (artefacts from polishing process) groups. The noisy band at around 3600 cm -1 (2.78
µm) for all three glasses was identified as the envelope of the rotational bands of
atmospheric water [2]. The bands in the 4500 to 6500 cm -1 (1.54 to 2.22 µm) region were
identified as overtones and combinations of CH and OH groups.
Fig. (6.7) shows the multiphonon edge of glasses in the series (80-x)TeO2-10Na2O-
10ZnO-xMO, where MO is PbO or GeO2, for MOD006 (x = 3 mol. % PbO), MOD010 (x
= 5 mol. % PbO) and MOD012 (x = 5 mol. % GeO2).
Absorption coefficient / cm -1
12
10
8
6
4
2
Wavelength / µm
6.5 6.4 6.3 6.2 6.1 6.0 5.9 5.8
(80-x)TeO 2 -10ZnO-10Na 2 O-xMO
(where MO is PbO or GeO 2 )
MOD006 (3 mol. % PbO)
MOD010 (5 mol. % PbO)
MOD012 (5 mol. % GeO 2 )
0
1525 1550 1575 1600 1625 1650 1675 1700 1725
Wavenumber / cm -1
Fig. (6.7): Multiphonon edge of glasses in the series (80-x)TeO2-10Na2O-10ZnO-xMO,
where MO is PbO or GeO2, for MOD006 (x = 3 mol. % PbO), MOD010 (x = 5 mol. %
PbO) and MOD012 (x = 5 mol. % GeO2).
Fig. (6.8) to (6.10) show Gaussian deconvolution of the OH bands in glasses MOD006
(77TeO2-10Na2O-10ZnO-3PbO mol. %), MOD010 (75TeO2-10Na2O-10ZnO-5PbO mol.