30 September 1994 Influences of simulated space radiation on optical glasses
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Abstract
Samples of 20 types of optical glass (both normal and radiation hardened crowns and flints, and fused silica), were subjected to both gamma (Co60) and proton radiation in air to simulate the dose expected over a 10 year lifetime in geostationary orbit. The samples were all 2 mm thick optically flat disks and were characterized before and after irradiation by spectral transmittance (250-800 nm) and wavefront error (approximately 630 nm) measurements. The geometry of the gamma irradiation was such that the outer area of each sample disk was covered by an annular lead shield giving a dose step of 50% of the nominal between the center and edge. This unique configuration gave rise to 'aperture imprinting' in some of the samples after Co60 irradiation, which was manifested as both a visible change in the coloration densities and a clear step in the measured interferograms from center to edge. The spectral transmission properties were much as expected from previously published work, with significant coloration and transmission loss in the near UV and the visible for the non cerium doped samples. The results of the tests are presented in summary form, conclusions are drawn with regard to the selection of optical glasses for application in space borne instrumentation, and recommendations for future work in this field are made.
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Dominic B. Doyle, Dominic B. Doyle, Reinhard H. Czichy, Reinhard H. Czichy, "Influences of simulated space radiation on optical glasses", Proc. SPIE 2210, Space Optics 1994: Space Instrumentation and Spacecraft Optics, (30 September 1994); doi: 10.1117/12.188103; https://doi.org/10.1117/12.188103
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