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Measurement of Temperature
Coefficients of Refractive Indices

Refractive index of materials changes per the change of the temperature.
Temperature coefficients of refractive index show the changes of refractive indices of the material when the temperature of the material raises by 1 degree C.
Usually the coefficient is achieved by averaging the change of the refractive indices of 20 degree C temperature range. We have various measuring methods depending on the type of the materials
:
 

Test materialsSolid
Optical Glasses/Optical crystalsPlastic
Wavelengths
or
spectrum lines
t,
C',
633nm,
D,e,F',g,i
Spectral lines
measurable
between
185nm~2325nm
t,
C,C',
633nm,
d,e,
F,F',g
Range of
temperature for
measurement
-40°C~80°C 20°C~28°C -10°C~40°C
Measuring
method
OHARA original
equipment
(Interferometri
cmethod)
Spectrometer
(Minimum
deviation
method)
Refractometer
(V- Block
method)
Size of
samples
40×40×10
(mm)
40×40×40
(mm)
15×15×3
(mm)

Typically, the temperature coefficients of refractive index are measured by our original measuring equipment which measures the amount of the variation of refractive indices per the change of the temperature. The other way the coefficients are derived is by using refractive indices measured at 2 different temperatures using a refractometer or spectrometer.

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

 


 
Glass Products
glass