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Développement de sources laser à fibre dopée Nd3+ pour une émission autour de 900 nm et 450 nm

Baptiste Leconte 1
1 LIOA - Lasers, Instrumentation Optique et Applications
CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
Abstract : Many fields including telecommunications and biomedicine require a laser source emitting in the blue spectral region with a diffraction-limited beam. To obtain such a source, the solution adopted in this thesis work is to develop a high-power Nd-doped fiber laser source operating on the 4F3/2-4I9/2 transition of Neodymium ion at 900 nm. After frequency doubling in a non-linear crystal, it is then possible to have access to wavelengths around 450 nm. However in aluminosilicate fibers, there is a strong competition between the three-level transition 4F3/2-4I9/2 of Nd3+ ion and the four-level scheme of the 4F3/2-4I11/2 transition around 1060 nm, which constitutes the main obstacle to overcome to obtain an efficient laser emission at 900 nm. As a first step, a theoretical study allows us to determine optimal geometrical parameters of double-clad Nd-doped fibers to foster laser emission on the transition of interest. Once fabricated by our industrial partner iXblue, the optimized fibers are used in several laser and amplification architectures leading for instance to wavelength-tunability on a wide spectral bandwidth around 900 nm and to selective amplification of transverse guided modes. In parallel, performances reached in terms of power and beam spatial quality at 900 nm permits an efficient frequency conversion, which led to the development of new blue laser sources operating in continuous-wave and pulsed regimes around 450 nm.
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  • HAL Id : tel-01505597, version 1


Baptiste Leconte. Développement de sources laser à fibre dopée Nd3+ pour une émission autour de 900 nm et 450 nm. Optique [physics.optics]. Université Caen Normandie, 2016. Français. ⟨tel-01505597⟩



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