The GLAD coatings (GLancing Angle Deposition) allow the manufacture of porous and structured optical thin films in order to decrease the refractive index of layers and so to achieve specific optical functions. Such properties may be useful to improve the performances of high power lasers as LMJ or Petal. For example polarization rotation is achievable by using such layers leading to optical smoothing to reduce plasma instabilities in the LMJ vacuum chamber.
The objective is to define the potential of GLAD technology for high power lasers. The main optical function to be studied will be polarization rotation but other functions can be explored when the numerical tools and manufacturing means have been set up and mastered. Collaborations with other research organizations developing this technology (LLE, University of Vilnius) will be developed to quickly elaborate and validate the first GLAD layers. These works of the thesis will allow to establish the limits of manufacturing and use of GLAD treatments.
In a first step, first GLAD structures will be realized quite quickly in a coater of the CEA-Le RIPAULT to be configured and numerical tools will be developed. Then the GLAD structures will be optimized and characterized on samples to evaluate their performances in terms of polarization rotation, laser induced damage, sensitivity to the environment, etc... These characterizations should also allow to validate/adjust the calculation tools. Finally, the limits of fabrication and use of GLAD coatings will be studied according to the desired optical functions.