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Etude du comportement dynamique des sources laser ultrarapides à base de fibres actives fortement dispersives

Abstract : Ultrafast fiber lasers represent today a ubiquitous technology in various industrial and research applications thanks to their inherent advantages such as compactness, stability and high power. The best performances to date, mostly relying on large mode area fibers and chirped pulse amplification, however require complex experimental developments and are limited by the use of bulk components for pulse stretching and compression. The experimental and numerical work presented in this PhD thesis aimed at exploring original dynamical regimes based on specific active fibers combining large mode area and high dispersions for the generation of high-energy ultra-short pulses. The numerical studies then showed that pulsed regimes with high normal dispersions could be reached by exploiting resonance and mode-coupling phenomena in Bragg or W-type fibers. Studying the influence of the cavity parameters on mode-locking mechanisms allowed to target attractive configurations for energy scaling. The experimental implementation of this concept allowed the development of a dissipative soliton source delivering record high-energy chirped pulses (38 nJ, 700 fs after compression) at 1560 nm. The realization of ultrafast sources based on specific active fibers combined to mode-coupling phenomena then brought the possibility to identify the potentiality and limitations of these particular architectures with high dispersions for energy scaling.
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Submitted on : Thursday, March 29, 2018 - 3:56:09 PM
Last modification on : Monday, December 16, 2019 - 1:39:52 PM


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  • HAL Id : tel-01753368, version 1


Mincheng Tang. Etude du comportement dynamique des sources laser ultrarapides à base de fibres actives fortement dispersives. Optique [physics.optics]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMR117⟩. ⟨tel-01753368⟩



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