An Improved Recording Refractometer for Optical Glasses in the Wavelength Range 300 to 2600 nm

Abstract

The paper describes a recording refractometer which has been designed to measure the refractive indices of optical glasses throughout their spectral transmitting range with greater reliability than has hitherto been possible; uncertainties of ±1 × 10-5 are obtainable. After a short history of earlier instruments, the design and construction are discussed in some detail. A section on measuring and calculating procedures is followed by an analysis of uncertainties and a brief consideration of future trends.

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