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Updated: Jun 4, 2026
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Experimental study and simulation of the damage induced to various multilayer interferential mirrors by soft x-ray
F Leguern1, J M André, J P Lebreton
1Laboratoire de Chimie Physique, Universit� Pierre et Marie Curie, URA CNRS 176, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, 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.
