Affiliations: Laboratoire de Chimie Physique, Université Pierre et
Marie Curie, URA CNRS 176, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05,
France. | Commissariat à l'Energie Atomique, C.E.M/M.R., B.P.
12, 91680 Bruyères-le-Châtel, France. | Commissariat à l'Energie Atomique, DLPP/ED, 94195
Villeneuve-Saint-George, France. | Institut d'Optique Théorique et Appliquée, URA
CNRS 14, Centre Universitaire d'Orsay, Bât. 503, B.P. 147, 91403 Orsay
Cedex, France.
Abstract: The damage induced to various multilayer interferential mirrors
(MIMs) by intense soft X-ray plasma-laser sources are studied both
experimentally and theoretically. The mirrors consist of periodic bilayers made
up with C/W, Si/Mo, Si/W\. One set of Si/W MIMs is coated with a 100 nm Si
film devised to protect the multilayer structure. In the experiment, one
resolves in time the evolution of the diffraction pattern of a MIM illuminated
by the radiation of a NaCl probing laser-plasma and exposed to the heating
radiation emitted by a gold laser-plasma. One measures the damage threshold
time and the damage threshold fluence. Simulations are performed by combining
an optical code with a Lagrangian thermomechanical code giving at each time the
density and the thickness of each layer in the MIM.
