Mode control using transversal bandgap structure in vcsels

H - Electricity – 01 – S

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H01S 5/183 (2006.01) H01S 5/42 (2006.01) G02B 6/12 (2006.01) H01S 5/10 (2006.01)

Patent

CA 2478174

A vertical cavity surface emitting laser (VCSEL) having a photonic band gap (PBG) region formed within or adjacent to a first and/or a second mirror, or within a spacer layer positioned between a gain region and at least one of the mirrors. The PBG region has a predetermined periodicity which substantially prevents the generated light from propagating the region, and defines a light aperture without the periodicity so as to allow the generated light to propagate through the aperture. The PBG region does not extend through the gain region, thereby allowing the full gain region to be used. Controls the efficiency of laser action by suppressing or preventing laser action in certain modes without losses, rather the modes are made forbidden. Energy from the forbidden modes is eventually coupled back to the allowed mode(s). Provides a separation of the confinement of the gain region and the mode control without introducing energy losses.

L'invention concerne un laser d'émission par la surface à cavité verticale (VCSEL) ayant une région de bande interdite (PBG) photonique formée dans, ou contiguë à un premier et/ou à un second miroir, ou dans une couche d'espacement placée entre une région de gain et au moins un miroir. La région PBG a une périodicité prédéterminée qui empêche sensiblement la lumière produite de se propager dans la région et définit un orifice de passage de lumière sans la périodicité de façon à permettre à la lumière produite de se propager par ledit orifice. La région PBG ne traverse pas la région de gain, ce qui permet d'utiliser la région de gain entière et de réguler l'efficacité de l'effet laser en supprimant ou en empêchant cet effet laser dans certains modes sans pertes, plutôt que d'interdire les modes. L'énergie dégagée des modes interdits est en fin de compte couplée au(x) mode(s) autorisé(s). L'invention concerne une séparation du confinement de la région de gain et de la commande de mode sans introduction de pertes d'énergie.

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