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Développement de lasers à trois niveaux pompés par diode dans les cristaux dopés néodyme et ytterbium

Marc Castaing 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : The replacement of gas lasers emitting at 488 nm or 442 nm by solid state configurations is a true challenge due to the industrial stake that it represents. Substitution solutions have been developed, nevertheless, the one consisting of the second harmonic generation (SHG) of 884 nm or 976 nm emissions in bulk configuration was always put away due to the three-level nature of the transitions which had to be used. Indeed the very strong re-absorption at the lasing wavelength (884 nm for Nd3+ and 976 nm for Yb3+) made them unsuitable for an efficient laser action in diode-pumped configuration. The improvement of the laser-diode brightness has recently opened the door for using these transitions. In this manuscript we present a theoretical and experimental study on diode-pumped three-level lasers in Nd3+ doped and Yb3+ doped crystals. Firstly, we propose the study of the direct diode pumping of an Nd:GdVO4 crystal, emitting at 880 nm, which after second harmonic generation give us an alternate solution to HeCd lasers. We present then, a new concept, the intracavity pumping, that we apply to Yb3+ doped materials, to achieve laser action around 980 nm. Indeed, inside a laser cavity, the very important circulating power is coupled to a good spatial beam quality; these two points are the key points for an efficient pumping of threelevel transitions. As a conclusion we give a comparison of the direct and indirect diode pumping of three-level laser transitions, and highlight the advantages of each configuration.
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https://pastel.archives-ouvertes.fr/tel-00461967
Contributor : Marc Castaing <>
Submitted on : Monday, March 8, 2010 - 9:31:00 AM
Last modification on : Wednesday, October 14, 2020 - 3:41:53 AM
Long-term archiving on: : Friday, June 18, 2010 - 8:49:22 PM

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  • HAL Id : tel-00461967, version 1

Citation

Marc Castaing. Développement de lasers à trois niveaux pompés par diode dans les cristaux dopés néodyme et ytterbium. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00461967⟩

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