Tellurite And Fluorotellurite Glasses For Active And Passive

6. Optical properties; MDO 200
Absorption coefficient / cm -1
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
4 3.8 3.6 3.4 3.2 3 2.8
y0 0 ±0
xc1 2953.27767 ±11.9114
w1 416.06733 ±10.56243
A1 94.81773 ±5.29757
xc2 3223.55641 ±5.11007
w2 276.96669 ±9.83858
A2 56.6069 ±6.00553
xc3 3384.02786 ±1.40624
w3 144.54882 ±5.30864
A3 16.02548 ±1.71867
Baseline: y=[(1490/x)^4]+0.371
Chi^2 = 0.00002
R^2 = 0.99818
Wavelength / µm
FTIR data
Gaussian fit
Strong OH (2953 cm -1 )
Weak OH (3224 cm -1 )
Free OH (3384 cm -1 )
2600 2800 3000 3200 3400 3600
Wavenumber / cm -1
Fig. (6.24): Gaussian deconvolution of the OH bands of glass MOD016 (70TeO2-
25WO3-5Bi2O3 mol. %).
Table (6.5) summarises the positions (P), half-widths (W), and areas (A) of these bands.
Table (6.5): Positions (P), half-widths (W), and areas (A) of OH bands for glasses
MOD014 (90TeO2-5WO3-5Nb2O5 mol. %), MOD015 (82.5TeO2-7.5WO3-10Nb2O5 mol.
%), and MOD016 (70TeO2-25WO3-5Bi2O3 mol. %).
Glass Strong OH Weak OH Free OH
MOD P /
ID cm -1
W /
cm -1
A /
(cm -1 ) 2
P /
cm -1
W /
cm -1
A /
(cm -1 ) 2
P /
cm -1
W /
cm -1
A /
(cm -1 ) 2
014 2964 420 84.44 3213 247 31.97 3377 152 15.20
015 2985 390 53.40 3239 249 26.38 3391 140 9.44
016 2953 416 94.82 3224 277 56.61 3384 145 16.03
Table (6.6) and fig. (6.25) summarise the areas of these bands.
350
300
250
200
150
100
50
0
Loss / dB.m -1