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

Product Code:
LP321
Manufacturer: M Cubed
Optical Measurement Services - Refractive Index, Dispersion and dN/dT

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M³ Measurement Solutions Inc. utilises a modified minimum deviation process to provide refractive index testing and dn/dT at temperature ranges from -196.15°C (77°K) to +100 °C (373.15°K) and wavelengths from 350nm to 14um. Dewar vacuum is nominally held to 1e-4 Torr. This process incorporates good thermally conductive fixturing with well controlled ramp rates and soak times to ensure thermal stability of the sample for accurate measurements. They use a half prism configuration for this process to achieve a nominal 30 degree refracted angle.

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

Measurement Ranges

 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. 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. 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

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

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