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Proceedings Paper

Measurements of index of refraction in the deep and vacuum ultraviolet using the minimum-deviation method
Author(s): John H. Burnett; Rajeev Gupta; Ulf Griesmann
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Paper Abstract

We discuss a procedure for making accurate measurement of the index of refraction, its dispersion, and its temperature dependence, in the deep ultraviolet (near 193 nm), using precision goniometric spectrometers and the minimum deviation method. Measurements of the indices of fused silica and calcium fluoride near 193 nm, with a fractional accuracy of 7 ppm, are discussed. These measurements revealed differences in the indices between different grades of fused silica. Accurate values of the temperature dependencies were determined from measurements of the indices at several temperatures in a 20 degree Celsius range about 20 degrees Celsius. A procedure to measure the index of calcium fluoride in the vacuum ultraviolet region (157 nm) using a N2 purge housing is discussed.

Paper Details

Date Published: 8 October 1998
PDF: 8 pages
Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); doi: 10.1117/12.326665
Show Author Affiliations
John H. Burnett, National Institute of Standards and Technology (United States)
Rajeev Gupta, National Institute of Standards and Technology (United States)
Ulf Griesmann, Harvard College Observatory (United States)

Published in SPIE Proceedings Vol. 3425:
Optical Diagnostic Methods for Inorganic Transmissive Materials
Raju V. Datla; Leonard M. Hanssen, Editor(s)

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