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Correction active du profil spatial de faisceaux amplifiés dans des fibres multimodes et multi-coeurs.

Mathieu Paurisse 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Fiber lasers and amplifiers are of great interest for reaching high output powers because of their advantages in terms of thermal behaviour and efficiency. The main limitation appears in the pulsed regime where the peak powers are limited by nonlinear effects and material damage. A widely studied solution to overcome this problem is to distribute the amplification over several separate fiber amplifiers and to phase lock them to obtain their coherent combining. These systems require a very accurate control of the phase of each amplifier and are quite difficult to align when the number of emitters increases. In this report, we study an alternative solution based on coherent combining applied to an integrated architecture. In this approach, either the modes of a multimode fiber or the cores of a multi-core fiber are phase locked using a spatial light modulator. Several experimental solutions have been studied to achieve phase locking : phase conjugation by active digital holography, electronic feedback loop based on an evolutionary algorithm, and direct measurement of the modal content of a multimode fiber using a wavefront analyzer. These developpements led to the amplification of nanosecond pulses close to the diffraction limit in multimode and multi-core fibers. Numerical simulations have also been performed to study the amplification process in multimode fibers and the use of evolutionary algorithms to shape the wavefront of multimode beams.
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Submitted on : Wednesday, February 23, 2011 - 11:03:10 AM
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  • HAL Id : tel-00567870, version 2

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Mathieu Paurisse. Correction active du profil spatial de faisceaux amplifiés dans des fibres multimodes et multi-coeurs.. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2010. Français. ⟨tel-00567870v2⟩

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