Improved mirror and cavity designs for sampled-grating...

H - Electricity – 01 – S

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H01S 5/125 (2006.01) H01S 5/0625 (2006.01) H01S 5/12 (2006.01)

Patent

CA 2405852

A tunable laser comprised of a gain section for creating a light beam by spontaneous emission over a bandwidth, a phase section for controlling the light beam around a center frequency of the bandwidth, a cavity for guiding and reflecting the light beam, a front mirror bounding an end of the cavity, and a back mirror bounding an opposite end of the cavity. The back mirror has a .kappa.effB approximately equal to .alpha.Tune, where .kappa.effB is an effective coupling constant and .alpha.Tune is the maximum amount of propagation loss anticipated for an amount of peak tuning required, and a length of the back mirror is made to produce greater than approximately 80 % reflectivity.

L'invention concerne un laser accordable qui comprend une section de gain permettant de créer un faisceau lumineux par émission spontanée sur une bande passante, une section de phase pour régler le faisceau lumineux autour d'une fréquence centrale de la bande passante, une cavité pour guider et réfléchir le faisceau lumineux, un miroir frontal bornant une extrémité de la cavité, et un miroir arrière bornant une extrémité opposée de la cavité. Le miroir arrière présente un .kappa.¿effB? approximativement égal à .alpha.¿Tune'? (.kappa.¿effB? étant une constante de couplage effective, et .alpha.¿Tune? une valeur maximale d'affaiblissement de propagation anticipé pour une valeur d'accord de pointe requise), tandis qu'une longueur du miroir arrière est conçue pour produire une réflectivité approximativement supérieure à 80 %.

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