Développements et nouveaux concepts pour les lasers solides ultraviolets

Loïc Deyra 1
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : In this thesis, we study new concepts and laser architecture for the development of high power, diode-pumped solid-state lasers frequency converted in the ultraviolet range (UV). Ultraviolet lasers are increasingly used in many manufacturing process and spectroscopic applications. We first demonstrate a novel laser architecture emitting at 236,5 nm using a frequency converted, pulsed nanosecond laser oscillator emitting at 946 nm based on a Nd:YAG single-crystal fiber. We demonstrate state-of-the-art performances by studying the main laser limitations and by optimizing the two frequency conversion stages. Then, we study two new non-linear crystals for frequency conversion in the UV : Ca5(BO3)3F (CBF), a new non-hygroscopic crystal for third harmonic generation to 343 nm, and a well-known crystal BaB2O4 (BBO) grown by an unusual growth method, the Czochralski (CZ) growth. We demonstrate the first UV generation experiment with CBF, and show that BBO crystals grown by the CZ method yield better conversion efficiencies in high average power, fourth harmonic generation to 257 nm experiments. Finally, we propose and demonstrate a new concept for frequency conversion called mechanical phase-matching. We managed to change a non-linear crystal’s properties significantly by applying a strong mechanical compression force on its facets.
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Loïc Deyra. Développements et nouveaux concepts pour les lasers solides ultraviolets. Optique [physics.optics]. Institut d’Optique Graduate School, 2014. Français. ⟨NNT : 2014IOTA0007⟩. ⟨tel-01080188⟩

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