The index of refraction of optical quality fused silica (SiO2) was determined for 60 wavelengths from 0.21 to 3.71 μ at 20°C. The dispersion equation
where λ is expressed in microns was found to yield an absolute residual of 10.5×10−6. The variation in index between 12 specimens was determined. Dispersive properties of the material and thermal coefficient of index are graphically presented. A comparison with previous NBS index data is discussed.
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Residuals for arithmetical-mean table of values compiled from experimental data of Corning (C), Dynasil (D), and General Electric (G.E.).
TCB=1,2,4-Trichlorobenzene.
Poly=Polystyrene.
Table II
Interspecimen variation of the refractive index of fused silica at 20°C from different sources.
λ
Corning residual×106
Dynasil residual×106
General Electric residual×106
μ
1
2
3
4
1
2
3
4
1
2
3
4
0.4047
11
26
24
20
4
27
21
21
11
12
−12
14
0.4861
16
27
16
21
5
29
19
21
7
15
−7
12
0.5461
14
24
22
17
5
33
25
16
11
12
−13
12
0.5893
12
27
23
27
0
18
20
22
12
13
−8
12
0.6563
12
23
19
19
1
27
22
23
13
10
−7
14
0.7065
17
28
20
18
2
31
23
23
13
15
−11
17
0.8944
11
26
22
19
3
31
19
25
11
12
−8
13
1.014
16
21
20
20
6
30
26
22
14
13
−11
14
1.083
15
24
25
25
7
35
25
25
13
16
−9
12
Av. Δn
13.5
24.9
20.0
21.6
3.5
27.4
20.4
20.5
11.3
12.9
−9.6
13.2
ν-value
67.78
67.78
67.86
67.80
67.78
67.80
67.85
67.85
67.88
67.77
67.82
67.84
NOTE: Numbered columns under each brand indicate individual specimens. The residuals are differences in the sixth decimal place of index between measured values and those computed by dispersion Eq. (1). Each Δn is an average for the 18 wavelengths which were used.
Of the 12 specimens listed above, specimen 1 of each brand is the same reported in Columns 5, 6, and 7 of Table I. Residuals for these specimens are based on results obtained on the Wild spectrometer, whereas the residuals for corresponding wavelengths of Table I are based on results obtained on a Gaertner spectrometer. This accounts for differences in residuals between tables.
Tables (2)
Table I
Computed refractive index of fused silica and residuals at 20°C for three specimens.
Residuals for arithmetical-mean table of values compiled from experimental data of Corning (C), Dynasil (D), and General Electric (G.E.).
TCB=1,2,4-Trichlorobenzene.
Poly=Polystyrene.
Table II
Interspecimen variation of the refractive index of fused silica at 20°C from different sources.
λ
Corning residual×106
Dynasil residual×106
General Electric residual×106
μ
1
2
3
4
1
2
3
4
1
2
3
4
0.4047
11
26
24
20
4
27
21
21
11
12
−12
14
0.4861
16
27
16
21
5
29
19
21
7
15
−7
12
0.5461
14
24
22
17
5
33
25
16
11
12
−13
12
0.5893
12
27
23
27
0
18
20
22
12
13
−8
12
0.6563
12
23
19
19
1
27
22
23
13
10
−7
14
0.7065
17
28
20
18
2
31
23
23
13
15
−11
17
0.8944
11
26
22
19
3
31
19
25
11
12
−8
13
1.014
16
21
20
20
6
30
26
22
14
13
−11
14
1.083
15
24
25
25
7
35
25
25
13
16
−9
12
Av. Δn
13.5
24.9
20.0
21.6
3.5
27.4
20.4
20.5
11.3
12.9
−9.6
13.2
ν-value
67.78
67.78
67.86
67.80
67.78
67.80
67.85
67.85
67.88
67.77
67.82
67.84
NOTE: Numbered columns under each brand indicate individual specimens. The residuals are differences in the sixth decimal place of index between measured values and those computed by dispersion Eq. (1). Each Δn is an average for the 18 wavelengths which were used.
Of the 12 specimens listed above, specimen 1 of each brand is the same reported in Columns 5, 6, and 7 of Table I. Residuals for these specimens are based on results obtained on the Wild spectrometer, whereas the residuals for corresponding wavelengths of Table I are based on results obtained on a Gaertner spectrometer. This accounts for differences in residuals between tables.
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