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Tellurite And Fluorotellurite Glasses For Active And Passive

Tellurite And Fluorotellurite Glasses For Active And Passive

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6. Optical properties; MDO 219<br />

Absorption coefficient / cm -1<br />

1.0 0.9 0.8 0.7 0.6 0.5<br />

1.3<br />

1.2<br />

1.1<br />

1.0<br />

0.9<br />

0.8<br />

0.7<br />

0.6<br />

0.5<br />

0.4<br />

0.3<br />

1 hr. 240 o C<br />

5 hr. 240 o C<br />

11 hr. 240 o C<br />

Wavelength / µm<br />

0.2<br />

10000 12000 14000 16000 18000 20000<br />

Wavenumber / cm -1<br />

Fig. (6.47): Visible spectra of glass MOF017 (69.86TeO2-9.98Na2O-19.96ZnF2-0.20ErF3<br />

mol. %), heat treated for 1, 5 and 11 hours at 240°C.<br />

It can be seen that the background absorption increased with increasing heat treatment<br />

time, due to scattering particularly at shorter wavelength.<br />

1300<br />

1200<br />

1100<br />

1000<br />

900<br />

800<br />

700<br />

600<br />

500<br />

400<br />

300<br />

200<br />

Loss / dB.m -1

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