18 February 2013 Update of Laser Mégajoule large optics wavefront performance requirements
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The Laser Mégajoule (LMJ) facility has about 40 large optics per beam. For 22 bundles with 8 beams per bundle, it will contain about 7.000 optical components. First experiments are scheduled at the end of 2014. LMJ components are now being delivered. Therefore, a set of acceptance criteria is needed when the optical components are exceeding the specifications. This set of rules is critical even for a small non-conformance ratio. This paper emphasizes the methodology applied to check or re-evaluate the wavefront requirements of LMJ large optics. First we remind how LMJ large component optical specifications are expressed and we describe their corresponding impacts on the laser chain. Depending on the location of the component in the laser chain, we explain the criteria on the laser performance considered in our impact analyses. Then, we give a review of the studied propagation issues. The performance analyses are mainly based on numerical simulations with Miró propagation simulation software. Analytical representations for the wavefront allow to study the propagation downstream local surface or bulk defects and also the propagation of a residual periodic aberration along the laser chain. Generation of random phase maps is also used a lot to study the propagation of component wavefront/surface errors, either with uniform distribution and controlled rms value on specific spatial bands, or following a specific wavefront/surface Power Spectral Distribution (PSD).
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stéphane Mainguy, Stéphane Mainguy, Jean-Philippe Airiau, Jean-Philippe Airiau, Thierry Bart, Thierry Bart, Vincent Beau, Vincent Beau, Edouard Bordenave, Edouard Bordenave, Stéphane Bouillet, Stéphane Bouillet, Christian Chappuis, Christian Chappuis, Sandrine Chico, Sandrine Chico, Philippe Cormont, Philippe Cormont, Nathalie Darbois, Nathalie Darbois, Jérome Daurios, Jérome Daurios, Vincent Denis, Vincent Denis, Laure Eupherte, Laure Eupherte, Nathalie Ferriou-Darbois, Nathalie Ferriou-Darbois, Servane Fontaine, Servane Fontaine, Gaël Gaborit, Gaël Gaborit, Claire Grosset-Grange, Claire Grosset-Grange, Eric Journot, Eric Journot, Laurent Lamaignère, Laurent Lamaignère, Thomas Lanternier, Thomas Lanternier, Eric Lavastre, Eric Lavastre, Christophe Leymarié, Christophe Leymarié, Louis-André Lompré, Louis-André Lompré, Mélanie Mangeant, Mélanie Mangeant, Cédric Maunier, Cédric Maunier, Jérome Néauport, Jérome Néauport, Etienne Perrot-Minnot, Etienne Perrot-Minnot, Gérard Razé, Gérard Razé, Stéphane Reyné, Stéphane Reyné, Claude Rouyer, Claude Rouyer, Jean-Michel Sajer, Jean-Michel Sajer, Stéphane Seznec, Stéphane Seznec, Daniel Taroux, Daniel Taroux, Sébastien Vermersch, Sébastien Vermersch, Laurent Le Déroff, Laurent Le Déroff, } "Update of Laser Mégajoule large optics wavefront performance requirements", Proc. SPIE 8602, High Power Lasers for Fusion Research II, 86020G (18 February 2013); doi: 10.1117/12.2004148; https://doi.org/10.1117/12.2004148


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