Graded reflectivity mirror resonators for lasers with a gain...

Details Graded reflectivity mirror resonators for lasers with a gain... Graded reflectivity mirror resonators for lasers with a gain...

H - Electricity

01

S

H01S 3/08 (2006.01) H01S 3/139 (2006.01) H01S 3/03 (2006.01)

Patent

CA 2072470

ABSTRACT A resonator for the modal control of a laser with a gain medium having a non-circular cross-section in a plane perpendicular to the optical axis of the resonator. It has a graded reflectivity mirror as the output coupler. The graded reflectivity mirror consists of a partial reflector which has a reflectivity that varies gradually according to the position on the mirror's surface. The resonator is either astigmatic or the graded reflectivity mirror has a non circularly symmetric reflectivity profile or both. It allows the production of a good optical quality beam with an efficient energy extraction.

ABREGE L'invention est un résonateur de sélection de mode pour lasers dont le milieu actif a une section non circulaire dans un plan perpendiculaire à l'axe optique de ce résonateur. Ce dernier utilise un miroir à réflectivité graduelle comme coupleur de sortie. Ce miroir est constitué d'un réflecteur partiel dont la réflectivité varie graduellement d'un point à l'autre sur sa surface. Le résonateur est astigmatique, ou bien le miroir a un profil de réflectivité symétrique non circulaire; ces caractéristiques peuvent toutefois être présentes toutes les deux. Le résonateur de l'invention permet d'obtenir un faisceau lumineux de bonne qualité avec une extraction efficace de l'énergie.

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