| タイトル | Cryogenic Refractive Index and Coefficient of Thermal Expansion for the S-TIH1 Glass |
| 本文（外部サイト） | http://hdl.handle.net/2060/20160000784 |
| 著者（英） | Leviton, Douglas; Quijada, Manuel A.; Content, David |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2013-08-29 |
| 言語 | eng |
| 内容記述 | Using the CHARMS facility at NASA GSFC, we have measured the cryogenic refractive index of the Ohara S-TIH1 glass from 0.40 to 2.53 micrometers and from 120 to 300 K. We have also examined the spectral dispersion and thermo-optic coefficients (dn/dT). We also derived temperature-dependent Sellmeier models from which refractive index may be calculated for any wavelength and temperature within the stated ranges of each model. The S-TIH1 glass we tested exhibited unusual behavior in the thermo-optic coefficient. We found that for delta < 0.5 micrometers, the index of refraction decrease with a decrease in temperature (positive dn/dT). However, the situation was reversed for delta larger than 0.63 micrometers, where the index will increase with a decrease in temperature (negative dn/dT). We also measured the coefficient of thermal expansion (CTE) for the similar batch of S-TIH1 glass in order to understand its thermal properties. The CTE showed a monotonic change with a decrease in temperature. |
| NASA分類 | Nonmetallic Materials; Spacecraft Instrumentation and Astrionics; Optics |
| レポートNO | GSFC-500-13-D-0266 |
| 権利 | No Copyright |
