Arrangement and method for electrically controlling the...

G - Physics – 02 – F

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G02F 1/01 (2006.01) G02F 1/1333 (2006.01) G02F 1/31 (2006.01) G02F 1/141 (2006.01)

Patent

CA 2297108

The invention relates to a device and method for electrically controlling the intensity of unpolarized light, wherein a polarising beam divider receives the light to be controlled via an entrance surface, so that said light is divided into two orthogonal polarised beams. A first device is provided to reflect at least one polarized luminous beam so that two luminous polarized beams can extend parallel to each other. At least one electro-optic element is arranged on the path of the luminous polarized beams. Said element modifies polarization according to the control voltage supplied. A second element reflecting the light beams in the opposite direction is also arranged so that the light beams pass though the electro-element(s) at least twice and are directed by the first reflecting device towards the polarised beam divider. The controlled light can be extracted from at least one entrance surface of the polarizing beam divider.

L'invention concerne un dispositif et un procédé permettant de commander électriquement l'intensité d'une lumière non polarisée. Selon l'invention, un diviseur de faisceau polarisant reçoit la lumière à commander par l'intermédiaire d'une surface d'entrée, de sorte que ladite lumière est divisée en deux faisceaux lumineux polarisés orthogonaux. Un premier dispositif réfléchissant est conçu pour réfléchir au moins un des faisceaux lumineux polarisés de sorte que les deux faisceaux lumineux polarisés s'étendent parallèlement l'un à l'autre. Sur le chemin des faisceaux lumineux polarisés parallèles sont disposés au moins un élément électro-optique, qui modifie la polarisation en fonction d'une tension de commande amenée jusqu'à lui, et un second dispositif réfléchissant, servant à réfléchir les faisceaux lumineux en sens inverse, de sorte que lesdits faisceaux lumineux passent deux fois par le ou les éléments électro-optique et sont dirigés par le premier dispositif réfléchissant vers le diviseur de faisceau polarisant, la lumière commandée pouvant être prélevée au moins au niveau d'une surface de sortie du diviseur de faisceau polarisant.

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