Tellurite And Fluorotellurite Glasses For Active And Passive

6. Optical properties; MDO 193
Absorption coefficient / cm -1
7
6
5
2
1
0
Wavelength / µm
6 5 4 3 2
MOD013: 80TeO 2 -10Na 2 O-10ZnO
2.98 mm
0.50 mm
0.20 mm
2000 3000 4000 5000 6000 7000
Wavenumber / cm -1
Fig. (6.15): Infrared spectra of the mid- and near-infrared regions for glasses of
composition MOD013 80TeO2-10Na2O-10ZnO mol. %, performed on samples of
thickness, 2.98, 0.50 and 0.20 mm.
It can be seen that the glasses background loss increased with decreasing sample
thickness. This was likely to be due to deflection of the beam in the spectrometer, arising
from the difficulty in making thin samples. The asymmetry of the higher intensity OH
band at around 3000 cm -1 became more prominent with decreasing thickness.
Figs. (6.16) and (6.17) show the Gaussian deconvolution of OH bands in glass
MOD007 (78TeO2-10Na2O-12ZnO mol. %) and MOD013 (80TeO2-10Na2O-10ZnO mol.
%).