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Amplification fibrée multivoie avec décomposition spectrale pour la synthèse d’impulsions femtosecondes

Abstract : Femtosecond pulses (fs) are used to produce no thermal light matter interactions which areinteresting for industrial, medical, or scientific activities. Lasers producing higher peak powerat a higher repetition rate are required. Ytterbium doped fiber sources are good candidates.However, pulse duration is still high (~ 300 fs) owing to spectral narrowing at high gainlevels. Peak power is also limited. Amplification in an array of amplifiers with spectralsplitting and fs pulse synthesis by coherent spectral combining is proposed as a solution.Spectral components are separately amplified before to coherently recombine the amplifieroutputs in a single beam. Phase management of the radiations from different amplifiers leadsto short pulse synthesis. Different setups are considered. After the choice and the gauging ofone of them, we amplified and synthesized 280 fs pulses through 12 uncoupled cores of amulticore fiber, without stretcher/compressor devices. We demonstrated the powerenhancement of this setup compared to a single amplifier, proportional to the square of thenumber of amplifier used. Compatibility of the setup with broadband amplification (≈ 40 nm)was demonstrated. In prospects, performance scaling in terms of peak power are in a first timedevelopped. The conception of an oscillator based of this amplification scheme to produce fsbroadband and energetic pulses is proposed in a second time.
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Philippe Rigaud. Amplification fibrée multivoie avec décomposition spectrale pour la synthèse d’impulsions femtosecondes. Electronique. Université de Limoges, 2014. Français. ⟨NNT : 2014LIMO0051⟩. ⟨tel-01137884⟩

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