Measuring space radiation impact on the characteristics of optical glasses: urement results and recommendations from testing a selected set of materials

Michel Fruit; Andrei I. Gusarov; Dominic B. Doyle

doi:10.1117/12.452255

11 November 2002 Measuring space radiation impact on the characteristics of optical glasses: measurement results and recommendations from testing a selected set of materials

Michel Fruit, Andrei I. Gusarov, Dominic B. Doyle

Author Affiliations +

Proceedings Volume 4823, Photonics for Space Environments VIII; (2002) https://doi.org/10.1117/12.452255
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Radiation sensitivity of glass is a general concern for the designer of Space optical instruments. ASTRIUM, in cooperation with SCK-CEN, has conducted a study (under ESA sponsorship) to define the approach for the gathering of a comprehensive database to quantify these effects through the use of linear sensitivity coefficients (called "Dose Coefficients"). These "Dose coefficients" cover not only transmittance but also other characteristics such as refractive index. After having recalled the basics of the proposed approach, results of the first irradiation tests which have been run on a selected set of classical glasses nd their Radiation hardened Cerium doped analogs (including BK7, K5, LaK9 and other Schott glasses) will be discussed. PRotons and gamma radiation have been performed with the aim to demonstrate equivalence, thus allowing to further considering only gamma radiation for an extensive testing of available glasses. Relaxation impacts on some months period have been tentatively analyzed. All these measurements have been processed and the modeling approach of the radiations impacts has been derived, as shown in the publication from A. Gusarov at this conference. This will constitute the grounds for the building of a comprehensive "Dose Coefficients" data base, as expressed in the publication from D. Doyle also at this conference. From this, recommendations for a sound characterization of radiation impacts on refractive optical materials have been established and are the subject of this publication.

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Michel Fruit, Andrei I. Gusarov, and Dominic B. Doyle "Measuring space radiation impact on the characteristics of optical glasses: measurement results and recommendations from testing a selected set of materials", Proc. SPIE 4823, Photonics for Space Environments VIII, (11 November 2002); https://doi.org/10.1117/12.452255

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