https://doi.org/10.1051/epjconf/20135907002
Recent progress in the development of pulse compression gratings
1 CEA CESTA, 33114 Le Barp, France
2 Institut Fresnel, CNRS UMR 6133, Aix-Marseille universités, École Centrale Marseille, Domaine Universitaire de Saint-Jérôme, 13397 Marseille, France
a e-mail: jerome.neauport@projet-lmj.org
Published online: 15 November 2013
The PETAL facility uses chirped pulse amplification (CPA) technique. This system needs large pulse compression gratings that request damage threshold better than 4 J/cm2 in normal beam at 1.053 μm for 500 fs pulses. In this paper, we will show recent grating designs with either multilayer dielectrics or hybrid metal-dielectric structures. We have shown in previous works that damage threshold is driven by the enhancement of the near electric field inside the pillars of the grating. This was evidenced from a macroscopic point of view by means of laser damage testing. We will show that damage morphology during damage initiation at the scale of the grating groove is also consistent with this electric field dependence.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
