<title>Space radiation testing of radiation-resistant glasses and crystals</title>

To PLAnetary Transit or not? An extremely large field of view camera with a CaF2component tested in thermo-vacuum

“…In particular this study has been focused on the radiation damage mechanisms in glasses so to investigate if the present proposed materials for the lenses of the TOUs are usable for the manufacturing of the optical components. Results over CaF 2 lens have confirmed its properties as a natural radiation hardened glass [3] [4]: no reduction in transmittance was observed after simulated exposure to protons having 5 MeV energy. Considering an irradiation of about 27000 rad over PLATO lifetime (8 years), it is expected that this lens should maintain the transmittance to the level of 96% or better over the whole range, while the other lenses subjected to similar irradiations, showed a decrease in transmittance of about 20-25%, varying for each wavelength [10].…”

Space radiation testing of thin film and multilayer optical coatings

“…Work performed in 2001 by Torrington and Hansen determined optical glasses self-anneal radiation damage over time at ambient temperatures [1]. Therefore to better mimic the damage that would be experienced from a low dose rate in the space environment, the post-irradiation transmission measurements were performed after a waiting period of 14 days.…”

“…In some cases the browning is so dark it renders the materials unusable. In addition, radiation effects on optical materials in general include changes of refractive index, and shrinking or swelling of the materials, significantly changing their performance [1]. For inorganic optical coatings, the risk of increased surface potential followed by dielectric breakdown is a significant hazard for optical surfaces that are wholly exposed to the space environment [2].…”

Effect of Ionizing Radiation on the Performance of Volume Holographic Elements

“…This level of changes should not influence the VHE performance. On the other hand, PTRG has a complicated chemical composition, which is known to influence the radiation sensitivity of glass [15], [16]. The structure of PTRG is also modified by UV exposure followed by the thermal development.…”