Tellurite And Fluorotellurite Glasses For Active And Passive

8. Fibre drawing; MDO 352
8.2.4. Optical loss of fluorotellurite fibre
Fig. (8.16) shows the optical loss of fibre of composition MOF005 (70TeO2-10Na2O-
20ZnF2 mol. %) with various melting times (3, 4, 5 and 10 hours) [9].
Loss / dB.m -1
40
35
30
25
20
15
10
5
0
2.5 2.0 1.5 1.0
Unfluorinated
Wavelength / µm
4000 6000 8000 10000 12000
0.000
14000
Wavenumber / cm -1
3 hr.
4 hr.
5 hr.
10 hr.
Fig. (8.16): Optical loss of fibre of composition MOF005 (70TeO2-10Na2O-20ZnF2 mol.
%) with various melting times (3, 4, 5 and 10 hours) [9].
It can be seen that optical loss was significantly reduced with increasing melting time.
Table (8.6) shows the losses at 4000 (2.5 µm), 6452 (1.55 µm), 7634 (1.31 µm), 10000 (1
µm), and 14000 cm -1 (714 nm) with increasing melting time for glass MOF005 (70TeO2-
10Na2O-20ZnF2 mol. %) [9].
0.040
0.035
0.030
0.025
0.020
0.015
0.010
0.005
Absorption coefficient / cm -1