Refractive index and dispersion of optical glass

Summary

The KPR-300 measures the refractive index automatically at multiple wavelengths (d-line, C-line, F-line), and calculates Abbe numbers. The measuring method of this instrument is a V-block method (Vee-block or Hilger-Chance method) with a reputation for refractive index measurement of optical glass and resin. Therefore, it can measure the refractive index with excellent accuracy and reproducibility.
Even with optical glass for polishing with stable optical characteristics, the general tolerance is ± 0.0003 in refractive index and ± 0.5% in Abbe number. In order to ensure stable optical performance taking into account the process of annealing, management is important depending on measured values.
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 small diameter lens

Measurement example

Fig1. Refractive index measurement result of crown glass(Equivalent to BK7)

Fig2. Refractive index measurement result of flint glass(Equivalent to F2)

※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