High-power fiber laser system

H - Electricity – 01 – S

Patent

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Details

H01S 3/067 (2006.01) H01S 5/12 (2006.01)

Patent

CA 2719900

The invention relates a power fiber laser system comprising at least one single-mode fiber laser, emitting at a signal wavelength (.lambda.), said fiber comprising at least one outer cladding and a core, characterized in that the core of said fiber has a radially graded index. Advantageously, the fiber comprises, at least over a part of its length, a geometrical section having a graded fiber-core radius that decreases between an input end of the section and an output end of the section, the core radius and the index variation between the cladding and the fiber at the input end being such that the normalized frequency V at the signal wavelength is less than the normalized cutoff frequency Vc at which the fiber becomes unimodal.

L'invention concerne un système à fibre laser de puissance comportant au moins une fibre laser monomode, émettant à une longueur d'onde signal (?), ladite fibre comportant au moins une gaine extérieure et un cur caractérisée en ce que ladite fibre présente en son cur un gradient d'indice radial. Avantageusement, la fibre comporte au moins sur une partie de sa longueur, un tronçon de géométrie présentant un rayon de cur de fibre à gradient décroissant entre une extrémité dite d'entrée du tronçon et une extrémité dite de sortie du tronçon, les paramètres de rayon de cur et de variation d'indice entre la gaine et la fibre au niveau de l'extrémité d'entrée étant tels que la fréquence normalisée V définie à la longueur d'onde signal est inférieure à la fréquence normalisée de coupure Vc à partir de laquelle la fibre présente un caractère monomode.

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