J. Phys. IV France
Volume 133, June 2006
Page(s) 653 - 655
Publié en ligne 16 juin 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 653-655

DOI: 10.1051/jp4:2006133130

Propagation of LIL/LMJ beams under the interaction with contamination particles and component surface defects

S. Mainguy and B. Le Garrec

Commissariat à l'Énergie Atomique, CEA/DAM/CESTA/DLP, BP. 2, 33114 Le Barp, France

This paper presents recent studies of the propagation of high-power laser beams like Laser Integration Line (LIL) and Laser MegaJoule (LMJ) beams, when interactions occur with environmental pollution particles and component defects. The studies are mainly achieved with the CEA-DAM MIRÓ beam propagation code. The highest intensifications in the downstream propagation are obtained for phase objects like dielectric particles, scratches or laser damage rather than for amplitude objects like metallic particles. Dramatic amplification of Kerr nonlinear effect leading to beam self-focusing inside the component is predicted depending on the particle size. The effect of statistical distributions of end-of-line phase defects on the LIL/LMJ 0.351-$\mu $m-wavelength focal spot intensity and size is quantified.

© EDP Sciences 2006