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Systèmes laser pompés par diode à fibres cristallines : oscillateurs Er : yAG, amplificateurs Nd : yAG

Igor Martial 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Lasers
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : In this thesis we investigate two different pulsed laser sources for two specific applications : remote sensing and material processing. On the first part, remote sensing require efficient laser source emitting in the eye-safe range (1.5 – 1.7 µm) and producing several millijoules per pulse at a few kilohertz. Efficient eye-safe laser sources use erbium doped gain media. Nevertheless, the complex electronic structure of the erbium ion leads to several parasitic effects which limit the energy at high repetition rate. In order to minimize those effects we have used the concept of single crystal fibers developed in a close collaboration between the Laboratoire Charles Fabry and the company Fibercryst. The specific geometry of single crystal fibers, merging the advantages of bulk crystals and optical fibers, allows us to overcome limits of current laser sources. On the other part, material processing require near-infrared pulsed laser sources (1 µm) with high pulse energy, high average power and high peak power. In such laser sources, the amplifying medium must be design to avoid both thermal effects and non liner effects. For this purpose, we used neodymium doped single crystal fibers as power amplifier to enhance the performance of passively q-switched microlasers operating at high repetition rate (1 to 100 kHz) and emitting short pulses (< 1 ns).
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Igor Martial. Systèmes laser pompés par diode à fibres cristallines : oscillateurs Er : yAG, amplificateurs Nd : yAG. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112298⟩. ⟨tel-00705198⟩

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