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Proceedings Paper

Cryogenic refractive index of Heraeus homosil glass
Author(s): Kevin H. Miller; Manuel A. Quijada; Douglas B. Leviton
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Paper Abstract

This paper reports measurements of the refractive index of Homosil (Heraeus) over the wavelength range of 0.34—3.16 μm and temperature range of 120—335 K. These measurements were performed by using the Cryogenic High Accuracy Refraction Measuring System (CHARMS) facility at the NASA’s Goddard Space Flight Center. These measurements were in support of an integrated Structural-Thermal-Optical-Performance (STOP) model that was developed for a fieldwidened Michelson interferometer that is being built and tested for the High Spectral Resolution Lidar (HSRL) project at the NASA Langley Research Center (LaRC). The cryogenic refractive index measurements were required in order to account for the highly sensitive performance of the HSRL instrument to changes in refractive index with temperature, temperature gradients, thermal expansion, and deformation due to mounting stresses. A dense coverage of the absolute refractive index over the aforementioned wavelength and temperature ranges was used to determine the thermo-optic coefficient (dn/dT) and dispersion relation (dn/dλ) as a function of wavelength and temperature. Our measurements of Homosil will be compared with measurements of other glasses from the fused silica family studied in CHARMS as well as measurements reported elsewhere in the literature.

Paper Details

Date Published: 23 August 2017
PDF: 9 pages
Proc. SPIE 10375, Current Developments in Lens Design and Optical Engineering XVIII, 1037509 (23 August 2017); doi: 10.1117/12.2274423
Show Author Affiliations
Kevin H. Miller, NASA Goddard Space Flight Ctr. (United States)
Manuel A. Quijada, NASA Goddard Space Flight Ctr. (United States)
Douglas B. Leviton, Leviton Metrology Solutions, Inc. (United States)

Published in SPIE Proceedings Vol. 10375:
Current Developments in Lens Design and Optical Engineering XVIII
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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