Wavelength tuning of photo-induced gratings

Details Wavelength tuning of photo-induced gratings Wavelength tuning of photo-induced gratings

G - Physics

02

B

G02B 5/18 (2006.01) G02B 6/34 (2006.01) G03F 7/20 (2006.01)

Patent

CA 2346475

Optical gratings having a range of possible Bragg wavelengths can be produced using a single phase mask by exposing the mask to a non-collimated spatially filtered beam of light. A spatial filter (30) removes high spatial frequency components from the beam, and a focusing system (36) directs the filtered beam to a phase mask (40). A rate at which the beam is focused and a spacing between the phase mask and a photo-sensitive waveguide (12) are varied to produce gratings in the waveguide having a range of possible periods.

On peut produire des réseaux de diffraction optiques possédant une plage de longueurs d'ondes de Bragg possibles, en utilisant un seul masque de phase, en exposant ce dernier à un faisceau lumineux filtré non collimaté dans l'espace. Un filtre spatial (30) supprime les composantes de fréquence spatiale élevée dudit faisceau, et un système de concentration (36) dirige le faisceau filtré sur un masque de phase (40). On modifie la vitesse à laquelle le faisceau est concentré et l'espacement entre le masque de phase et un guide d'onde photosensible (12) pour produire des réseaux de diffraction dans le guide d'onde présentant une plage de périodes possibles.

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