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Cryogenic Refractive Index of Heraeus Homosil GlassThis paper reports measurements of the refractive index of Homosil (Heraeus) over the wavelength range of 0.34-3.16 microns and temperature range of 120-335 K. These measurements were performed by using the Cryogenic High Accuracy Refraction Measuring System (CHARMS) facility at the NASAs Goddard Space Flight Center. These measurements were in support of an integrated Structural-Thermal-Optical-Performance (STOP) model that was developed for a field-widened 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 sensitivity 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/d(lamda)) 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 literature.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Miller, Kevin H.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Quijada, Manuel A.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Leviton, Douglas B.
(Genesis Engineering Solutions, Inc. Lanham, MD, United States)
Date Acquired
August 8, 2017
Publication Date
August 6, 2017
Subject Category
Report/Patent Number
Meeting Information
Meeting: SPIE Optics + Photonics 2017
Location: San Diego, CA
Country: United States
Start Date: August 6, 2017
End Date: August 10, 2017
Sponsors: International Society for Optical Engineering
Funding Number(s)
Distribution Limits
Public Use Permitted.
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