Fibre laser with intra-cavity frequency doubling

H - Electricity – 01 – S

Patent

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Details

H01S 3/067 (2006.01) H01S 3/0941 (2006.01) H01S 3/109 (2006.01)

Patent

CA 2731806

The invention disclosed herein relates to fibre lasers with intra-cavity frequency doubling. In one embodiment, the invention is directed to a Fibre laser with intra-cavity frequency doubling characterized in that a non-linear crystal (NC) of type II phase matching is used to thereby enable operation of the fibre laser without selection of polarisation of the generated fundamental radiation. The non-linear crystal (NC) is oriented so as to minimise the walk- off angle of the second harmonic radiation, and a second dichroic mirror (M2) together with one of a plurality of focusing elements (L3) forms a telescopic reflector (L3, M2) that provides for focusing and compensation of the spatial walk-off effect of the non-linear crystal (NC).

L'invention concerne des lasers à fibre avec un doublage de fréquence intracavité. Dans un mode de réalisation, l'invention se rapporte à un laser à fibre avec un doublage de fréquence intracavité caractérisé en ce qu'un cristal non linéaire ayant une correspondance de phase de type II est utilisé pour permettre, de ce fait, un fonctionnement du laser à fibre sans une sélection de polarisation du rayonnement fondamental généré. Le cristal non linéaire est orienté de sorte à réduire au minimum l'angle de décrochage du second rayonnement harmonique et un second miroir dichroïque conjointement avec un élément d'une pluralité d'éléments de focalisation forme un réflecteur télescopique qui offre une focalisation et une compensation de l'effet de décorchage spatial du cristal non linéaire.

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