Optical element having wavelength selectivity

G - Physics – 02 – B

Patent

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Details

G02B 5/28 (2006.01) C23C 14/34 (2006.01) G02B 3/00 (2006.01) G02B 5/00 (2006.01) G02B 5/20 (2006.01) G02B 6/28 (2006.01) G02B 6/34 (2006.01) G02B 27/10 (2006.01) H04B 10/12 (2006.01) G02B 6/32 (2006.01)

Patent

CA 2384998

An optical element having a wavelength selectivity, which can be easily manufactured at a low cost. This optical element includes: a lens array (12) having one end face and a plurality of lenses (L1 to L8) arranged on the end face; and a multi-layered film (13) formed on one end face (14) of the lens array. The multi-layered filter has alternately laminated high-refractive- index dielectric layers and low-refractive-index dielectric layers, the thicknesses of which is continuously varied according to the individual positions of the lenses. The light having passed through the multi-layered film has different center wavelengths according to the position of the lens array. When mixed beams light are shone from the individual lenses onto the multi-layered filter, they are separated into beams of light of different center wavelengths by the multi-layered filter having different thicknesses.

La présente invention concerne un élément optique à sélectivité de longueur d'onde, qui peut être facilement fabriqué à faible coût. Cet élément optique comprend: un réseau de lentilles (12) possédant une extrémité et une pluralité de lentilles (L1 à L8) agencées sur cette extrémité, et un film multicouche (13) formé sur une extrémité (14) de ce réseau de lentilles. Le filtre multicouche possède des couches diélectriques à indice de réfraction élevé et des couches diélectriques à indice de réfraction faible laminées en alternance, dont les épaisseurs varient continuellement en fonction des positions respectives des lentilles. La lumière ayant traversé le film multicouche possède différentes longueurs d'onde centrales en fonction de la position du réseau de lentilles. Lorsque les faisceaux de lumière mélangés luisent en provenance des lentilles individuelles sur ce filtre multicouche, ils sont séparés en faisceaux de lumière de différentes longueurs d'onde centrales par ce filtre multicouche possédant des épaisseurs différentes.

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