Photonic signal frequency conversion using a photonic band...

G - Physics – 02 – F

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G02F 1/37 (2006.01) G02B 6/12 (2006.01) G02B 6/122 (2006.01) G02F 1/355 (2006.01) G02F 1/35 (2006.01) G02F 1/39 (2006.01) H01S 3/30 (2006.01)

Patent

CA 2327170

A novel SH generator based on a photonic band gap (PBG), mixed half-quarter- wave, periodic structure is described. Both energy output and conversion efficiencies are nearly three orders of magnitude greater than for bulk, phase- matched devices of comparable lengths. Similiar results for a GaAs/AlAs semiconductor periodic structure are also found. These results have immediate applications in frequency up- and down-conversion lasers, higher and lower harmonic generation, and Raman-type lasers, where either Stokes or anti-Stokes resonances can be enhanced or suppressed near the band edge. In general, the underlying mechanism requires the fields to be strongly confined, allowing for longer interactions times, increased effective gain lengths, and enhanced conversion efficiencies, although strong pump confinement alone can also result in significantly enhanced SH generation.

L'invention concerne un nouveau générateur d'une seconde harmonique utilisant une structure périodique, de bande interdite photonique (PBG), hybride demi-onde quart d'onde. La production d'énergie et le rendement de conversion sont quasiment trois ordres supérieurs à des dispositifs en milieu ambiant à concordance de phase aux longueurs comparables. On obtient des résultats semblables pour une structure périodique à semi-conducteur GaAs/A1As. Ces résultats sont utilisés immédiatement dans des lasers de conversion de fréquence, pour la génération d'une harmonique supérieure ou inférieure, et pour des lasers de type Ramam. Les résonance Stokes ou anti-Stokes peuvent être améliorées ou supprimées à proximité du bord de bande. En général, les logiques mises en oeuvre nécessitent que les champs soient fortement confinés, assurant ainsi des durées d'interaction plus longues, des longueurs de gain améliorées et efficaces et des rendements de conversion améliorés. Il est à noter qu'on peut aboutir à une génération d'une seconde harmonique sensiblement plus forte uniquement grâce à un puissant confinement de la pompe.

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