Measuring the refractive index with precision goniometers: a comparative study

Stefan Krey; Dennis Off; Aiko Ruprecht

doi:10.1117/12.2041760

8 March 2014 Measuring the refractive index with precision goniometers: a comparative study

Stefan Krey, Dennis Off, Aiko Ruprecht

Proceedings Volume 8992, Photonic Instrumentation Engineering; 89920D (2014) https://doi.org/10.1117/12.2041760
Event: SPIE OPTO, 2014, San Francisco, California, United States

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.

Citation Download Citation

Stefan Krey, Dennis Off, and Aiko Ruprecht "Measuring the refractive index with precision goniometers: a comparative study", Proc. SPIE 8992, Photonic Instrumentation Engineering, 89920D (8 March 2014); https://doi.org/10.1117/12.2041760

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