Tellurite And Fluorotellurite Glasses For Active And Passive

6. Optical properties; MDO 197
Absorption coefficient / cm -1
Absorption coefficent / cm -1
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
6.0 5.5 5.0
1770 cm -1
5.65 µm
25 mol. % WO 3
7.5 mol. % WO 3
5 mol. % WO 3
Wavelength / µm
6 5 4 3
0
1500 2000 2500 3000 3500 4000
Wavenumber / cm -1
5% WO 3
Wavelength / µm
7.5% WO 3
Symmetric vibration of WO 4 tetrahedra at
930 cm -1 , 1st overtone at 2 x 930 = 1860 cm -1
1870 cm -1
5.35 µm
overtone at 2 x 870 = 1740 cm
0
1600 1650 1700 1750 1800 1850 1900 1950 2000
-1
Wavenumber / cm -1
25% WO 3
Assymmetric vibration of WO 6 octahedra at 870 cm -1 , 1st
MOD014
MOD015
MOD016
Fig. (6.19): Infrared spectra of glasses MOD014 (90TeO2-5WO3-5Nb2O5 mol. %),
MOD015 (82.5TeO2-7.5WO3-10Nb2O5 mol. %), and MOD016 (70TeO2-25WO3-5Bi2O3
mol. %).
MOD014
MOD015
MOD016
Fig. (6.20): Multiphonon-edges of glasses MOD014 (90TeO2-5WO3-5Nb2O5 mol. %),
MOD015 (82.5TeO2-7.5WO3-10Nb2O5 mol. %), and MOD016 (70TeO2-25WO3-5Bi2O3
mol. %).