The modern way of refractive index measurement of optical glass at SCHOTT

Fabian Rupp; Ralf Jedamzik; Lothar Bartelmess; Uwe Petzold

doi:10.1117/12.2597023

12 September 2021 The modern way of refractive index measurement of optical glass at SCHOTT

Fabian Rupp, Ralf Jedamzik, Lothar Bartelmess, Uwe Petzold

Proceedings Volume 11873, Optical Fabrication, Testing, and Metrology VII; 1187308 (2021) https://doi.org/10.1117/12.2597023
Event: SPIE Optical Systems Design, 2021, Online Only

Abstract

The refractive index is the most important property of optical glass. Therefore, refractive index measurement is a key characterization method also for process control. The requirements for refractive index control demand a fast and accurate measurement method for production control and a very high accurate measurement method for tightest requirements. For refractive index measurement two different measurement setups are common: the v-block refractometer for economic refractive index control up to the fifths digit and the spectral goniometer for high precision index measurement over a broad wavelength range from 185 nm to 2.325 μm up to the sixth digit. Providing Sellmeier dispersion equation data for individual measurements enables accurate interpolation of index data for arbitrary wavelengths for high precision applications. To cope with specific production requirements and the required high reliability of the measurements SCHOTT develops its own measurement setups. Both, the v-block system and the high precision spectral goniometer have been updated in recent time. To evaluate the accuracy SCHOTT participates in international round-robin tests. SCHOTT is also participating in the standardization of refractive index measurement methods for the optical industry. In this paper the current status of refractive index measurement of optical glasses at SCHOTT is presented.

Conference Presentation

Citation Download Citation

Fabian Rupp, Ralf Jedamzik, Lothar Bartelmess, and Uwe Petzold "The modern way of refractive index measurement of optical glass at SCHOTT", Proc. SPIE 11873, Optical Fabrication, Testing, and Metrology VII, 1187308 (12 September 2021); https://doi.org/10.1117/12.2597023

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