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Optical Measurement Services - Refractive Index, Dispersion and dN/dT

M³ Measurement Solutions provide Refractive Index measurement services for materials used for near to far infrared applications as well as down to the UV. They also provide Refractive Index measurement services as a function of temperature down to cryogenic temperatures to give dn/dt data. Optical materials which can benefit from such measurements include Silicon, Germanium, Zinc Sulphide, Zinc Selenide as well as Chalcogenide glasses.

Through the combination of high-end precision technology and intelligent software design, M³ (M Cubed) optics metrology department now offers the following measurements:

Tests

  • Index of Refraction (RI)
  • dn/dt (Refractive Index vs. Temperature Measurement)
  • Dispersion (Refractive Index vs. Wavelength Measurement)
  • Birefringence (Refractive Index Measurement of Anisotropic Materials)

All of M³ instruments are calibrated and NIST traceable. M³ are currently in process of performing validation measurements with a SRM (Standard Reference Material) from NIST."

Measurement Ranges

M³ provides refractive index measurements at wavelengths from 350nm to 14um, and temperature ranges from 77°K to +100°C (373°K).

Measurement Method

Refractive index is measured via a modified minimum deviation technique. In utilizing this technique, a small prism must be manufactured from the material under test. M³ can sub-contract the prism manufacture or work with customers who wish to supply the finished prism substrate themselves.

Data

M³ can provide data in many different formats depending on your specific needs. M³ can supply various types of curve fitting and dispersion algorithms (e.g. Herzberger, Schott, Sellmeier etc). Full reports can be provided in Power Point, Word, PDF, and Excel formats.

Accuracies

M³ can reach accuracies to the fourth and fifth decimal place depending on material type and sample configuration.