Amplificateurs laser à cristaux massifs pompés par diode : fibres cristallines Yb : YAG et cristaux Nd : YVO4

Xavier Delen 1
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : A wide range of scientific and industrial applications require pulsed laser sources delivering increasing amount of powers and pulse energies. Continuous progresses in the field of laser technology do not only bring significant process efficiency improvements but also allow developing new applications. However, the complexity of laser sources has significantly increased over the years together with their performance. In contrast, this work focuses on power amplifier architectures which are particularly simple (with one or two passes). In the first part, we study the potential of Yb:YAG single crystal fibers. Pump intensity confinement by the pump beam guiding is studied in details both theoretically and experimentally. Two experiments demonstrate the interest of Yb:YAG single crystal fibers as a power amplifier for fiber based laser sources, one in femtosecond regime and the other one with a single frequency laser. Furthermore, the potential of our architecture is also explored in high power regime. An output power of 250 W for the oscillator and 100 W power extraction with the amplifier were obtained with a 600 W pump diode. The second part describes the study of laser amplifiers using longitudinally pumped Nd:YVO4 bulk crystals. We study the effect of temperature increase in the laser crystal and evaluate the influence of the doping concentration and excited state population on the heat load. Guided by the conclusion of our study, we design a high gain amplifier characterized by very high optical gain (40-60 dB) coupled to a high average power extraction (10 to 15 W)
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Xavier Delen. Amplificateurs laser à cristaux massifs pompés par diode : fibres cristallines Yb : YAG et cristaux Nd : YVO4. Autre. Institut d’Optique Graduate School, 2013. Français. ⟨NNT : 2013IOTA0002⟩. ⟨pastel-00996931⟩

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