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Proceedings Paper

Preliminary design of the cavity-end deformable mirror of the megajoule laser
Author(s): Xavier Bozec; Renaud Mercier-Ythier; Jean-Louis Carel; Pierre Coustal; Jean Luc Michelin
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Paper Abstract

This paper describes a preliminary design to realize a 400 X 400 mm2 active deformable mirror in the framework of the LaserMegajoule French program. The proposed design is based on a force control strategy. Forces are generated by specific designed electromechanical actuators and transmitted to a Zerodur mirror through an annular soft pad. This pad is optimized to filter high frequency ripple generated by the spatial sampling of the efforts at the back of the mirror in order to decrease the needed number of actuators, and thus the cost of the deformable mirror, a specific optimization method has been developed and is applied to determine the best actuator pattern fitted on the wavefront aberrations to be corrected. Analysis, calculations, finite elements models, preliminary test and validations on breadboard models have shown that the proposed design in compliant with the functional and operation requirements. A design description and the main justifications, as the guidelines of mirror integration are given in this paper. Due to the simplicity of the concept and the use of validate and mastered technologies at SFIM Industries and REOSC, the design present a good reliability. Furthermore, a complete and very easy to work maintainability is favored by this deformable mirror definition. Each parts of the system is easily removable and replaceable on the laser line without carrying out a heavy procedure and complex tools.

Paper Details

Date Published: 23 July 1999
PDF: 9 pages
Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); doi: 10.1117/12.354182
Show Author Affiliations
Xavier Bozec, REOSC and SFIM Industries (France)
Renaud Mercier-Ythier, REOSC and SFIM Industries (France)
Jean-Louis Carel, REOSC and SFIM Industries (France)
Pierre Coustal, REOSC and SFIM Industries (France)
Jean Luc Michelin, REOSC and SFIM Industries (France)

Published in SPIE Proceedings Vol. 3492:
Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion
W. Howard Lowdermilk, Editor(s)

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