Properties of Cathodoluminescence for Cryogenic Applications of SiO2-based Space Observatory Optics and Coatings
- Author:
- Meloy, Robert
- Published:
- August 25, 2013.
- Physical Description:
- 1 electronic document
- Additional Creators:
- Bowers Charles W., Dekany, Justin, Dennison, J.R., Wilson, Gregory, Evans, Amberly, and Heaney, James B.
Online Version
- hdl.handle.net , Connect to this object online.
- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access - Summary:
- Disordered thin film SiO2SiOx coatings undergoing electron-beam bombardment exhibit cathodoluminescence, which can produce deleterious stray background light in cryogenic space-based astronomical observatories exposed to high-energy electron fluxes from space plasmas. As future observatory missions push the envelope into more extreme environments and more complex and sensitive detection, a fundamental understanding of the dependencies of this cathodoluminescence becomes critical to meet performance objectives of these advanced space-based observatories. Measurements of absolute radiance and emission spectra as functions of incident electron energy, flux, and power typical of space environments are presented for thin (60-200 nm) SiO2SiOx optical coatings on reflective metal substrates over a range of sample temperatures (40-400 K) and emission wavelengths (260-5000 nm). Luminescent intensity and peak wavelengths of four distinct bands were observed in UVVISNIR emission spectra, ranging from 300 nm to 1000 nm. A simple model is proposed that describes the dependence of cathodoluminescence on irradiation time, incident flux and energy, sample thickness, and temperature.
- Other Subject(s):
- Collection:
- NASA Technical Reports Server (NTRS) Collection.
- Note:
- Document ID: 20140010163.
GSFC-E-DAA-TN10868.
SPIE Optics + Photonics; 25-29 Aug. 2013; San Diego, CA; United States. - Terms of Use and Reproduction:
- Copyright, Distribution as joint owner in the copyright.
View MARC record | catkey: 15426628