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Theses

Etude et réalisation de lasers à fibre auto-impulsionnels à
base d'absorbants saturables

Abstract : The first part of this thesis consists in the study and the realization of erbium-doped fibre laser passively Q-switched by iron-doped InGaAs/InP multiple quantum well semiconductor saturable absorber. Moreover simple modelling based on the rate equations has been developed and allows the understanding of the main output characteristics of our laser such as the shape of the pulse.
Then, we realize a passively mode-locked fibre laser. The amplifyer medium is a erbium-doped fibre and the ultrafast saturable absorber is a iron-doped InGaAs/InP multiple quantum wells structure. In this configuration, self-starting mode-locking is obtained. 700 fs pulses are measured with both saturable absorber and polarization effects.
In the third part of this study, we use ultra-fast saturable absorber (500 fs) as a cavity end-mirror. 300 fs optical pulses are obtained. With the same cavity, Saturable Absorber Incorporating NanoTubes (SAINT) can self-start stable mode-locking whatever the dispersion of the cavity (soliton or Stretched-pulse regime). More than 150 pJ pulse energy is obtained and the pulse duration is included between 700 fs (soliton) and few picoseconds (stretched pulse).
Finally we have realized a high-energy Q-switched fibre laser by semiconductor saturable absorber GaAs. The amplifyer medium is a double-clad ytterbium-doped fibre. We obtain optical pulses of several micro-joules (7 µJ) with duration of 1 µs. The laser can be tuned over 30 nm around the central wavelength (1,07 µm).
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https://tel.archives-ouvertes.fr/tel-00130694
Contributor : Jean-Bernard Lecourt <>
Submitted on : Tuesday, February 13, 2007 - 1:52:05 PM
Last modification on : Tuesday, February 5, 2019 - 11:44:12 AM
Long-term archiving on: : Friday, September 21, 2012 - 11:25:26 AM

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  • HAL Id : tel-00130694, version 1

Citation

Jean-Bernard Lecourt. Etude et réalisation de lasers à fibre auto-impulsionnels à
base d'absorbants saturables. Physique Atomique [physics.atom-ph]. Université de Rouen, 2006. Français. ⟨tel-00130694⟩

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