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Proceedings Paper

Ion beam manufacturing of a graded-phase mirror for the generation of square "top hat" laser beams
Author(s): R. Mercier; M. Lamare; M. Mullot; V. Bagnoud; X. Ribeyre; J. Luce; J. Néauport
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Paper Abstract

Spatially-engineered "top-hat" laser beams are used in solid-state high-energy lasers in order to increase the energy extraction efficiency in the amplifiers. To shape the laser beam, an efficient alternative to serrated apertures is to modify a laser cavity so that it naturally generates this "top-hat" beam, replacing a mirror of the laser cavity by a graded phase mirror. Its complex shape can be approached by microlithographic techniques based on an iterative mask and etch technique, but many steps are required to avoid large phase steps. The broad-beam ion-etching technique is well suited to manufacture such surfaces, with a good precision and a perfectly smooth surface. We shall present the technique we used for square top-hat beam generation. We shall detail the mask optimisation, combining simultaneous simulation of the ion etching and the beam build-up in the front-end laser. We shall present the results of the surface testing and the final test of the component in the laser.

Paper Details

Date Published: 25 September 2008
PDF: 5 pages
Proc. SPIE 7102, Optical Fabrication, Testing, and Metrology III, 71020E (25 September 2008); doi: 10.1117/12.797629
Show Author Affiliations
R. Mercier, Institut d'Optique (France)
M. Lamare, Institut d'Optique (France)
M. Mullot, Institut d'Optique (France)
V. Bagnoud, Gesellschaft für Schwerionenforschung Darmstadt GmbH (Germany)
X. Ribeyre, CELIA, Univ. Bordeaux I (France)
J. Luce, CEA Cesta (France)
J. Néauport, CEA Cesta (France)

Published in SPIE Proceedings Vol. 7102:
Optical Fabrication, Testing, and Metrology III
Angela Duparré; Roland Geyl, Editor(s)

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