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Achromatic damage investigations on mirrors for UV-free electron lasers

 
: Gatto, A.; Kaiser, N.; Thielsch, R.; Garzella, D.; Hirsch, M.; Nutarelli, D.; Ninno, G. de; Renault, E.; Couprie, M.E.; Torchio, P.; Alvisi, M.; Albrand, G.; Amra,C.; Marsi, M.; Trovo, M.; Walker, R.; Grewe, M.; Roger, J.P.; Boccara, C

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Exarhos, G.J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser-induced damage in optical materials 2000. Proceedings
Bellingham/Wash.: SPIE, 2001 (SPIE Proceedings Series 4347)
ISBN: 0-8194-4036-1
pp.535-546
Symposium on Optical Materials for High Power Lasers <32, 2000, Boulder/Colo.>
English
Conference Paper
Fraunhofer IOF ()
UV material; optical coating; deposition technology; dielectric mirror; synchrotron radiation; achromatic damage

Abstract
Storage Ring Free Electron Laser (FEL) are attractive, full of promise, tuneable and powerful laser sources for the UV range. High reflectivity dielectric mirrors should be produced in order to allow lasing at very short wavelength, with a long stability in a strongly harsh environment and to optimize the extracted FEL power required for most of the newest applications. The front mirror of the laser cavity receives all the synchrotron radiation (SR) emitted by the wiggler, which is the responsible for the mirror degradation, combined with the contamination by the vacuum residuals. We are tackling the problem of tests and manufactures of reliable robust mirrors and explore themes such as resistance analysis of UV mirrors to FEL multiscale power, broadband (X-UV) mirror robustness. Under drastic SR conditions, multiscale wavelength damages could be observed. Specific measurement techniques, able to investigate localised spatial modification induced by the non uniform synchrotron radiatio n are presented. A local crystalline structure modification of the high index material appears together with a severe increase of the roughness.

: http://publica.fraunhofer.de/documents/N-8179.html