Share Email Print
cover

Proceedings Paper

Cryogenic refractive indices of S-LAH55, S-LAH55V, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14 Glasses
Author(s): Kevin H. Miller; Manuel A. Quijada; Douglas B. Leviton
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The Transiting Exoplanet Survey Satellite (TESS) is an explorer-class planet finder whose principal goal is to detect small planets with bright host stars in the solar neighborhood. The TESS payload consists of four identical cameras with seven lens elements, each made from various Ohara glass. The successful implementation of both the panchromatic and the thermal aspect of these lens assemblies requires accurate knowledge of the thermal and spectral dependence of the refractive index in the wavelength and temperature ranges of operation. Hence, this paper reports measurements of the refractive index for the following Ohara glasses over the wavelength range 0.42 – 1.10 μm and temperature range ~120 – 300 K: S-LAH55, S-LAH55V, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14. The measurements were performed using the Cryogenic High Accuracy Refraction Measuring System (CHARMS) facility at NASA Goddard Space Flight Center. Dense coverage of absolute refractive indices of these glasses over the aforementioned wavelength and temperature ranges allowed accurate determination of spectral thermo-optic coefficients (dn/dT) and spectral dispersions (dn/dλ) as a function of temperature. A comparison of measured, temperature-dependent indices to literature values is presented for S-PHM52 and S-TIH14. A comparison to Ohara’s catalog indices at room temperature is presented for all of the materials.

Paper Details

Date Published: 3 September 2015
PDF: 15 pages
Proc. SPIE 9578, Current Developments in Lens Design and Optical Engineering XVI, 95780L (3 September 2015); doi: 10.1117/12.2188194
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. 9578:
Current Developments in Lens Design and Optical Engineering XVI
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

© SPIE. Terms of Use
Back to Top