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Details of Refractive Indices

Measurement of refractive indices of solid

Chart 1 : Examples of measurements and the methods

Material characteristics Measuring materials Measuring method
Isotropic materials Optical glass, Silica glass, etc. Refractometer (V-Block method)
or
Spectrometer (Minimum deviation method)
Crystals of cubic system(CaF2,Si,ZnS,ZnSe,etc)
Plastics (without birefringence) Refractometer (V-Block Method)
Anisotropy materials Uniaxial crystals(Quartz,TiO2,Sapphire,LBO,etc) Spectrometer (Minimum deviation method)
Refractometer (V-Block method)
Please refer Chart 2 for spectral lines measurable and the accuracy of the measurements.

Chart2 : Spectral lines measurable and the accuracy.

Spectral lines Measuring Equipment
MÖLLERWEDEL Carl Zeiss
Jena
Wavelength Symbols Symbols
of lamps
(Light
source)
Super
Precision
Spectro
meter
Type1
Precision
Spectro
meter
Type 2
Refracto
meter
Type
PR-2
Ultra precision Precision Standard Standard
in air
(nm)
in
vacuum
(nm)
Measuring
Accuracy
(10-6)
Measuring
Accuracy
(10-5)
Measuring
Accuracy
(10-5)
Measuring
Accuracy
(10-5)
2325.42 2326.05   Hg ±5 ±3 × ×
1970.09 1970.63   Hg ±5 ±3 × ×
1529.58 1530.00   Hg ±5 ±3 × ×
1128.64 1128.95   Hg ±5 ±3 × ×
1013.98 1014.26 t Hg ±2 ±1 ±3 ±5
852.110 852.344 s Cs ±2 ±1 ±3 ±5
706.519 706.714 r He ±2 ±1 ±3 ±5
656.273 656.454 C H2 ±2 ±1 ±3 ±3
643.847 644.025 C' Cd ±2 ±1 ±3 ±3
632.82 632.99   He-
Ne
±2 ±1 ±3 ±3
587.562 587.725 d He ±2 ±1 ±3 ±3
546.075 546.227 e Hg ±2 ±1 ±3 ±3
486.133 486.269 F H2 ±2 ±1 ±3 ±3
479.992 480.126 F' Cd ±2 ±1 ±3 ±3
435.835 435.957 g Hg ±2 ±1 ±3 ±3
404.656 404.770 h Hg ±2 ±1 ±3 ±5
365.015 365.119 i Hg ±2 ±1 ±3 ×
334.148 334.244   Hg ±5 ±1 × ×
289.360 289.444   Hg ±5 ±1 × ×
253.652 253.728   Hg ±5 ±1 × ×
228.802 228.872   Cd ±5 ±1 × ×
214.438 214.506   Cd ±5 ±1 × ×
206.200 206.266   Zn ±5 ±1 × ×
- 194.227   Hg ±5 ±3 × ×
- 184.950   Hg ±5 ±3 × ×

Measurement Center Links
1 Measurement Center
2 Refractive Indices of Solid
3 Temperature Coefficient
(of refractive index)
4 Birefringence
Additional Measurement Information
Optical Homogeneity
(Refractive index variation over an aperture)
Refractive Indices / Vacuum UV area
Photo Tour / Measurement Center


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