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Proceedings Paper

Measuring a laser focal spot on a large intensity range: effect of optical component laser damages on the focal spot
Author(s): Stéphane Bouillet; Sandrine Chico; Laurent Le Deroff; Gérard Razé; Roger Courchinoux
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Paper Abstract

LIL and LMJ are two French high power lasers dedicated to fusion and plasma experiments. Mastering the characteristics of the focal spots focused on the targets during the experiments is very important. In order to analyze the focal spots in its high power lasers, the CEA has developed an independent set-up that enables to measure energy spatial profiles over a 5 decade dynamic range by the means of several acquisitions taken at different power levels. The different data sets are then stitched to obtain a high dynamic picture of the beam. The experiment can also be used as a photometer enabling to measure the energy transmitted by an optical component. We used this set-up to study the effect of different parameters on the energy spatial profile of the focal spots. We have measured the effect of laser damages (on the optical components of the beam) on the energy scattered around the main focal spot. We also demonstrated that the level of this scattered power can be calculated from a near-field picture of the beam or even with pictures of the damaged components taken with an appropriate lighting.

Paper Details

Date Published: 24 August 2009
PDF: 8 pages
Proc. SPIE 7405, Instrumentation, Metrology, and Standards for Nanomanufacturing III, 74050W (24 August 2009); doi: 10.1117/12.827962
Show Author Affiliations
Stéphane Bouillet, Commissariat à l'Energie Atomique (France)
Sandrine Chico, Commissariat à l'Energie Atomique (France)
Laurent Le Deroff, Commissariat à l'Energie Atomique (France)
Gérard Razé, Commissariat à l'Energie Atomique (France)
Roger Courchinoux, Commissariat à l'Energie Atomique (France)

Published in SPIE Proceedings Vol. 7405:
Instrumentation, Metrology, and Standards for Nanomanufacturing III
Michael T. Postek; John A. Allgair, Editor(s)

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