Materials for Optics and Photonics in Extreme Radiative Environments – MOPEREresponsible Y. Ouerdane
Energetic radiation can produce structural and electronic distortions in materials, localized on the scale of an atom., causing a change of the optical properties of the material. The MOPERE project focuses on detecting and characterizing radiation effects in optical silica-based materials and optical fibers on atomic scales, specifically defect centers that are formed in optical devices in severe radiative environments (gamma, X, optical photons, electrons, etc.). The questions of interest are linked to the formation mechanisms and the associated relaxation dynamics using a coupled experimental/simulation approach for radiation effects in dielectrics. The approach responds to present challenges related to the emergence of new radiative environments hosting optical systems for diagnostic and control such as large power laser facilities, energy facilities, nuclear storage capacities, outer space. The main objective is related to understanding how optical components, particularly optical fibers, degrade in harsh environments and to propose efficient material or system architectures (composition, structure) able to resists to physical constraints and prolonging therefore their service lifetime. The activity is largely based on in-situ and ex-situ spectroscopic studies (optical absorption, Raman scattering, photoluminescence and spin resonance)) on samples with designed composition, accompanied by multiscale models for simulating the response of silicates under irradiation.
Ab-initio simulation of point defects in various silica-based materials and the associated optical properties.
Increasing lifetime of optical fibers subject to high cumulative X-ray and neutron doses.