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Proceedings Paper

Measuring the refractive index with precision goniometers: a comparative study
Author(s): Stefan Krey; Dennis Off; Aiko Ruprecht
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Paper Abstract

The accurate knowledge about the refractive index of optical materials is crucial for the production of high performance optical components. It is known that the highest accuracy of refractive index measurements can be achieved with goniometric measurements of prisms prepared from the optical material. The most common approach is the method of minimum deviation of Newton-Fraunhofer. The apex angle is measured with a high precision in reflection with an autocollimator and the angle of refraction is measured in transmission using an additional collimator. There are also other goniometric approaches like the Abb´e method employing a purely reflective setup with an autocollimator. In this paper we discuss and compare the two different goniometric approaches.

Paper Details

Date Published: 8 March 2014
PDF: 10 pages
Proc. SPIE 8992, Photonic Instrumentation Engineering, 89920D (8 March 2014); doi: 10.1117/12.2041760
Show Author Affiliations
Stefan Krey, TRIOPTICS GmbH (Germany)
Dennis Off, TRIOPTICS GmbH (Germany)
Aiko Ruprecht, TRIOPTICS GmbH (Germany)


Published in SPIE Proceedings Vol. 8992:
Photonic Instrumentation Engineering
Yakov G. Soskind; Craig Olson, Editor(s)

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