Sources laser de forte énergie à base d'YbCaF2

Kévin Genevrier 1
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : This PHD work is aiming at the development of a pump source for the nanosecond OPCPA of the 10 PW laser Apollon.First, we present the characteristics of the multipetawatt systems and the interest of OPCPA architecture for this type of systems. After detailing its characteristics, we then justify the choice of Yb:CaF2 as active media for the development of the nanosecond OPCPA pump source. We finally end the first chapter by the preliminary design of the pump source which is adapted to the specificities of the Yb:CaF2 crystal.The second chapter begins by the study of thermal lenses and thermal induced depolarization under high-power pumping in function of polarization or crystal orientation. The results allow us to validate the choice of [111] orientation for active media in the frame of high power laser systems. We then focus on ceramics because their mechanical isotropy appears to be interesting for high power systems. We study the ceramics made by wet route synthesis and highlight a strong heating, restricting their utilization. Several hypothesis are then investigated to explain this effect.In the last chapter we finished the design of the pump source with simulations of absorption, gain and energy extraction. We finally detailed the experimental results for two different architectures (regenerative and multipass), using Yb:CaF2 crystals in active mirror configuration.
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Kévin Genevrier. Sources laser de forte énergie à base d'YbCaF2. Optique [physics.optics]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLO006⟩. ⟨tel-02068749v2⟩

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