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Lasers femtoseconde de forte puissance moyenne à base de cristaux dopés à l’ytterbium

Sandrine Ricaud 1
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : This work concerns the development of high average power or high energy laser with diode-pumped ytterbium-doped materials. Two host matrices were studied, CALGO (CaGdAlO4) and fluoride, which permit the generation of ultra-short pulses. Spectroscopic and thermal properties of ytterbium doped CALGO crystals are adapted for the development of high average power oscillator. In this area, thin disk technology seems to be particularly interesting for the development of such oscillator. That’s why we choose to master this technology with ytterbium-doped CALGO crystals. Thus, Yb:CALGO oscillator with the highest average power was developed (28 W), with more than µJ energy and pulse duration of 300 fs. Using more doped and thinner crystals should permit to improve our performances, however they are already at the state of the art of high average power oscillator.Ytterbium doped CaF2 has a great interest for short-pulse high energy amplifier, thanks to its capacity to store energy. Two types of amplifier were developed. A regenerative amplifier with high gain (~106), mJ energy level, and a multipass amplifier with lower gain (~10) but permitting to extract really high energy (up to 160 mJ).Potential of these materials for the development of short pulse high average power and/or high energy system was demonstrated.
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Sandrine Ricaud. Lasers femtoseconde de forte puissance moyenne à base de cristaux dopés à l’ytterbium. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2012. Français. ⟨NNT : 2012PA112337⟩. ⟨tel-00772105⟩

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