Properties of cathodoluminescence for cryogenic applications of SiO2-based space observatory optics and coatings

Amberly Evans Jensen; J.R. Dennison; Gregory Wilson; Justin Dekany; Charles W. Bowers; Robert Meloy; James B. Heaney

doi:10.1117/12.2030231

27 September 2013 Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings

Amberly Evans Jensen, J.R. Dennison, Gregory Wilson, Justin Dekany, Charles W. Bowers, Robert Meloy, James B. Heaney

Author Affiliations +

Proceedings Volume 8863, Cryogenic Optical Systems and Instruments 2013; 88630A (2013) https://doi.org/10.1117/12.2030231
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Disordered thin film SiO₂/SiO_x 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) SiO₂/SiO_x 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 UV/VIS/NIR 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.

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Amberly Evans Jensen, J.R. Dennison, Gregory Wilson, Justin Dekany, Charles W. Bowers, Robert Meloy, and James B. Heaney "Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings", Proc. SPIE 8863, Cryogenic Optical Systems and Instruments 2013, 88630A (27 September 2013); https://doi.org/10.1117/12.2030231

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