Tellurite And Fluorotellurite Glasses For Active And Passive

Refractive index, n , at 632.8 nm
6. Optical properties; MDO 223
1.97
1.96
1.95
1.94
1.93
1.92
1.91
1.90
1.89
1.88
y = 0.06371x + 1.89170
R 2 = 0.90430
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Fraction oxide
Fig. (6.49): Variation of refractive index at 633 nm with increasing oxide to fluoride ratio
of glasses in the series 65TeO2-(25-x)ZnF2-xZnO-10Na2O mol. %, for 5 ≤ x ≤ 25 mol. %
(MOF009 to 013). Glass MOF001 (65TeO2-25ZnF2-10Na2O mol. %) used for oxide /
fluoride = 0.
It can be seen that refractive index increased with increasing ZnO content, however
variation was greater than the series shown in fig. (6.48).
6.3. Discussion
The results presented in the previous section (6.2) are discussed here in the same order,
starting with the infrared absorption spectra of oxide tellurite and fluorotellurite glasses.
These are followed by the emission spectra of heat treated Er +3 -doped fluorotellurite
glasses. Refractive indices of oxide tellurite and fluorotellurite glasses are then discussed.
To conclude, a core / clad pair is selected for fibre drawing, based on properties discussed
in this chapter, and chapter 4.