System and method for permanently writing a diffraction...

G - Physics – 02 – B

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G02B 5/18 (2006.01) G02B 6/10 (2006.01)

Patent

CA 2664379

A system and method for permanently writing diffraction gratings in low phonon energy glass waveguides are shown. Ultrashort light pulses are generated and made to form two beams synchronously superimposed in the waveguide, therefore forming an interference pattern corresponding to the desired grating. The light pulses are focussed so that the light intensity in the waveguide exceeds a filamentation threshold. The exposure of the waveguide to these light pulses is controlled temporally and spatially in order to limit detrimental thermal effects induced by the high-intensity pulses in the glass medium of the waveguide.

La présente invention concerne un système et un procédé permettant d'écrire de façon permanente des réseaux de diffraction dans des guides d'ondes en verre à faible énergie de phonons. Des impulsions lumineuses ultracourtes sont générées et amenées à former deux faisceaux superposés de manière synchrone dans le guide d'ondes, formant, de ce fait, un motif d'interférence correspondant au réseau souhaité. Les impulsions lumineuses sont concentrées de telle sorte que l'intensité lumineuse dans le guide d'ondes dépasse un seuil de filamentation. L'exposition du guide d'ondes à ces impulsions lumineuses est commandée dans le temps et dans l'espace afin de limiter les effets thermiques nuisibles provoqués par les impulsions à haute intensité sur le support en verre du guide d'ondes.

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