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Theses

Formation du spectre optique dans les lasers Raman à fibre

Abstract : The work presented in this thesis deals with the formation of the optical power spectrum in Raman fiber lasers. We carried out an experimental study on a Raman fiber laser oscillating in a Pérot-Fabry cavity closed by fiber Bragg grating mirrors. We report that the shape of the optical spectrum is power dependent. Developing several models, we show that fiber Bragg gratings are responsible for this property of the optical power spectrum. In particular, at low power, the asymetric shape of the spectrum is due to dispersive effects occurring in fiber Bragg grating mirrors. At high laser power, those dispersive effects are dominated by the filtering action of fiber Bragg grating mirrors, which results in a symetrisation of the optical power spectrum observed in our experiment. In addition, we have also studied numerically the statistics of the intracavity Stokes field. We show that the field statistics strongly depends on whether Stokes light is incident or reflected by cavity mirrors. This result allows us to question the validity of a model recently developped in order to describe the formation of the optical power spectrum in Raman fiber lasers. This model relies on the recent tools of wave kinetic theory which is valid exclusively in the case of nearly gaussian fields statistics. However, our numerical study seems to indicate this condition is not fulfilled in Raman fiber lasers, and the shape of the optical spectrum observed in our experiment contrasts with the one predicted by this statistical approach of the formation of the optical power spectrum in Raman fiber lasers.
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https://tel.archives-ouvertes.fr/tel-00628627
Contributor : Nicolas Dalloz <>
Submitted on : Monday, October 3, 2011 - 5:45:41 PM
Last modification on : Wednesday, October 21, 2020 - 3:40:57 AM
Long-term archiving on: : Wednesday, January 4, 2012 - 2:31:15 AM

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  • HAL Id : tel-00628627, version 1

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Nicolas Dalloz. Formation du spectre optique dans les lasers Raman à fibre. Physique Atomique [physics.atom-ph]. Université des Sciences et Technologie de Lille - Lille I, 2011. Français. ⟨tel-00628627⟩

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