Refractive index and dispersion of small diameter lens : SHIMADZU CORPORATION

Summary

KPR-300 is a V-block method (Vee-block or Hilger-Chance method) with a reputation for measuring the refractive index of optical glass and plastic. KPR-300 can measure the refractive index of a small sample or resin material that can not be measured with a spectrometer(Minimum deviation method).
For molded lenses used for smartphones and others, the refractive index varies depending on the thermal history during molding. Therefore, management based on measured values is important for quality control.
It can be used for material development, quality control at the time of material manufacturing, and acquisition of necessary information to design optimized for use conditions.

Related information: Refractive index and dispersion of optical glass

Measurement example

Samples :

small diameter lens (Diameter 3 mm, Thickness 1 mm)

Conditions :

Measurement temperature - 23 ℃
Measurement wavelength - 3 wavelength (F-line, d-line, C-line)

Contact liquid – nd 1.52

Result :

Small diameter lens is attached to the base of the glass plate. After that, it is processed into a shape that can be measured. Results of refractive index nd 1.516350 and Abbe number νd 64.03 were obtained. The refractive index can be measured with the resolution (6 digits below the decimal point) necessary for grasping the optical performance, and the Abbe number can be calculated.

Fig1. Small diameter lens fixed to the base (after processing)

$Fig2. Refractive index measurement result of small diameter lens$

Fig2. Refractive index measurement result of small diameter lens

※It is a typical value obtained by this measurement. It does not guarantee the refractive index and the Abbe number of each sample.

Equipment configuration

No	Item	Note
1	Refractometer KPR-300	Click here for details
2	V-Block Prism 516-641A (nd = 1.52)
3	Contact liquid nd 1.52