J.-P. Chambaret

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Our goal is to robust configurations for terawatt/petawatt-class power amplifiers. We investigate the processes involved in Ti:Sa pumping: damage threshold of amplifying material, beam transport (relay-image or homogenization) and coherence properties of pump lasers.
The pumping of large Ti:sapphire crystals, in order to reach petawatt-level laser amplification, is the careful control of the spatial energy distribution of 100 Joule-class SHG Nd:glass pump lasers. Nanosecond neodymium-based pump lasers exhibit poor spatial and temporal profile quality, which can lead to local hot spots, responsible for strong intensity(More)
We have studied experimentally and theoretically the parasitic lasing phenomenon in large-aperture Ti:sapphire crystals to optimize the amplification scheme of petawatt class Ti:sapphire laser. Simulations, first experimental results and strategy of amplification will be presented.
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