Composite optical fibre for a laser- and pump-wave confinement

G - Physics – 02 – B

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G02B 6/02 (2006.01) H01S 3/067 (2006.01)

Patent

CA 2596691

The invention relates to a composite optical fibre (1) for a laser comprising a core (2) which is surrounded by a pump guide sheath that is in contact with the core. The pump guide sheath (4) comprises a photonic structure formed by an essentially-regular matrix array of coaxial capillaries which are spaced apart and disposed parallel to the core in a pump guide sheath material. The aforementioned core is disposed in a core material together with doping elements which can be placed in at least one excited electronic state by absorption of the energy of an optical pump signal with a first determined wavelength passing through said core and which can return same by means of deexcitation in the form of an optical signal with a second determined wavelength, said core having a determined diameter and said pump guide sheath having a determined diameter. The invention is characterised in that the pump guide sheath diameter is greater than the core diameter and less than or equal to four times the core diameter, said core diameter being greater than or equal to 35 micrometers.

L'invention concerne une fibre optique composite (1 ) pour laser comportant un cAEur (2) entouré d'une une gaine guide de pompe au contact du cAEur, la gaine guide de pompe (4) étant une structure photonique formée d'un ensemble sensiblement régulier matriciel de capillaires coaxiaux et espacés disposés parallèlement au cAEur dans un matériau de gaine guide de pompe, le cAEur étant dans un matériau de cAEur avec en outre des éléments dopants pouvant être mis dans au moins un état électronique excité par absorption de l'énergie d'un signal optique de pompe d'une première longueur d'onde déterminée traversant ledit cAEur et pouvant la restituer par désexcitation sous forme d'un signal optique d'une seconde longueur d'onde déterminée, le cAEur ayant un diamètre déterminé et la gaine guide de pompe ayant un diamètre déterminé. Elle est caractérisée en ce que le diamètre de gaine guide de pompe est supérieur au diamètre de cAEur et inférieur ou égal à quatre fois le diamètre de cAEur, le diamètre du cAEur étant supérieur ou égal à 35 micromètres.

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