Affiliation:
1. Commissariat à l’Énergie Atomique et aux Énergies Alternatives–Centre d’Études Scientifiques et Techniques d’Aquitaine (CEA-CESTA)
2. Aix-Marseille Univ
Abstract
PETAL (Petawatt Aquitaine Laser) is an ultrahigh-power laser dedicated
to academic research that delivers sub-picosecond pulses. One of the
major issues of these facilities is the laser damage on optical
components located at the final stage. Transport mirrors of the PETAL
facility are illuminated under different polarization directions. This
configuration motivates a thorough investigation of the dependency of
the laser damage growth features (thresholds, dynamics, and damage
site morphologies) on the incident polarization. Damage growth
experiments were carried out in s- and
p-polarization at 0.8 ps and 1053 nm on
multilayer dielectric mirrors with a squared top-hat beam. Damage
growth coefficients are determined by measuring the evolution of the
damaged area for both polarizations. In this Letter, we report higher
damage growth threshold in p-polarization together with higher damage initiation
threshold in s-polarization. We also
report faster damage growth dynamics in p-polarization. The damage site morphologies and their
evolution under successive pulses are found to strongly depend on
polarization. A numerical model in 3D was developed to assess
experimental observations. This model shows the relative differences
in damage growth threshold even if it is not able to reproduce the
damage growth rate. Numerical results demonstrate that damage growth
is mainly driven by the electric field distribution which depends on
the polarization.
Subject
Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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