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Radiation resistance of optical materials against synchrotron radiation

: Günster, S.; Blaschke, H.; Ristau, D.; Gatto, A.; Heber, J.; Kaiser, N.; Diviacco, B.; Marsi, M.; Trovo, M.; Sarto, F.; Scaglione, S.; Masetti, E.


Exarhos, G.J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.; Lawrence Livermore National Laboratory; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Laser-induced damage in optical materials 2002. Proceedings : 34th Boulder Damage Symposium, 16 - 18 September 2002, Boulder, Colorado, 7th International Workshop on Laser Beam and Optics Characterization, 18 - 19 September 2002, Boulder, Colorado
Bellingham/Wash.: SPIE, 2003 (SPIE Proceedings Series 4932)
ISBN: 0-8194-4727-7
International Workshop on Laser Beam and Optics Characterization (LBOC) <7, 2002, Boulder/Colo.>
Annual Boulder Damage Symposium <34, 2002, Boulder/Colo.>
Symposium on Optical Materials for High-Power Lasers <34, 2002, Boulder/Colo.>
Conference Paper
Fraunhofer IOF ()
synchrotron radiation; radiation resistance; calcium fluoride

Radiation resistance of optical materials against synchrotron radiation is important, if optical components for the high energetic regime should be produced. In the framework of the European project EUFELE, which deals with the development of optical coatings for the free electron laser at ELETTRA (Trieste), a set of C aF2 substrates was irradiated with synchrotron radiation. The synchrotron radiation was varied by wavelength, dose, and high energetic background. Before and after irradiation, the CaF2 substrates were investigated spectrophotometrically in the VUV, VIS and IR range. The surface structure was characterised by microscope methods. Structure investigations were done with XRD measurements. CaF2 shows different types of degradation like colour centre formation, surface modification, and increased VUV absorption bands. Defect formation will be presented in dependence of synchrotron irradiation conditions.