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Combinaison cohérente de diodes laser de luminance élevée en cavité externe

David Pabœuf 1 
1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : The constant and growing demand for compact and efficient laser sources leads to explore new architectures aiming at increasing the output powers of laser diodes. The most promising solution consists in utilizing several moderate-power identical lasers in parallel. It is then necessary to induce a constant phase relationship between the lasers to maintain the spatial beam quality. We present a theoretical and experimental study of the passive phase locking of an array of high-power diode lasers. We take benefit of the angular and spectral filtering properties of volume Bragg gratings in an external cavity. Two solutions have been considered: the first one uses the self-imaging Talbot effect and the second one consists in a selective angular filtering of the array emission. A theoretical model aiming at determining the modal behavior of those two cavities has been realized. Moreover, concerning the Talbot cavity, in collaboration with the University of Nottingham, a cavity model taking into account the internal properties of the diode lasers has also been used. Experimentally, several cavity setups adapted to different array geometries have been investigated. Each of them achieved a coherent emission. We show that the use of volume Bragg gratings inside the cavity improve both the coherence and the spectrum of the lasers. Finally, we present an original solution using phase filters to convert the multilobed beam from the laser cavity into a Gaussian beam profile.
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Submitted on : Thursday, December 10, 2009 - 9:47:14 AM
Last modification on : Saturday, June 25, 2022 - 11:14:19 AM
Long-term archiving on: : Saturday, November 26, 2016 - 4:49:04 PM


  • HAL Id : tel-00438708, version 2



David Pabœuf. Combinaison cohérente de diodes laser de luminance élevée en cavité externe. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00438708v2⟩



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