Optical isolator

G - Physics – 02 – B

Patent

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Details

G02B 27/28 (2006.01) G02F 1/09 (2006.01)

Patent

CA 2115721

An optical isolator comprising first through fourth plate-like birefringent substances, each for receiving and transmitting an incident beam of light. Each plate-like birefringent substance has a corresponding optical axis which is inclined with respect to a direction of the incident beam of light. The optical isolator also includes first and second magneto-optical materials, each for rotating a plane of polarization of the incident beam of light. The optical axis of the second plate-like birefringent substance is rotated by one of -45° and 135° about a first axis which is perpendicular to a surface of the first plate-like birefringent substance. The optical axis of the third plate-like birefringent substance is rotated by one of 45° and 225° about a second axis which is perpendicular to the surface of the first plate-like birefringent substance. The optical axis of the fourth plate-like birefringent substance is rotated by one of -90° and 90° about a third axis which is perpendicular to the surface of the first plate-like birefringent substance. The first and third plate-like birefringent substance having thicknesses which are equal. The second and fourth plate-like birefringent substances each have a thickness which is (1 + ~2) times as thick as the first plate-like birefringent substance. The second magneto-optical material rotates the plane of polarization in a direction which is opposite to the direction of rotation of the first magneto-optical material. Finally, the optical isolator includes a magnetized element for magnetizing the first and second magneto-optical materials.

L'invention est constituée par un isolateur optique comportant quatre substances biréfringentes sous la forme de plaques servant chacune à recevoir et à transmettre un faisceau de lumière incidente. Chaque plaque biréfringente a un axe optique incliné par rapport à direction du faisceau de lumière incidente. L'isolateur optique comprend également deux matériaux magnéto-optiques utilisés pour faire tourner le plan de polarisation du faisceau de lumière incident. L'axe optique de la seconde plaque biréfringente est soumis à une rotation de -45° ou de 135° par rapport à un premier axe perpendiculaire à la surface de la première plaque biréfringente. L'axe optique de la troisième plaque biréfringente subit une rotation de 45° ou de 225° par rapport à un second axe perpendiculaire à la surface de la première plaque biréfringente. L'axe optique de la quatrième plaque biréfringente subit une rotation de -90° ou de 90° par rapport à un troisième axe perpendiculaire à la surface de la première plaque biréfringente. La première et la troisième plaques biréfringentes ont la même épaisseur. La seconde et la quatrième plaques biréfringentes ont toutes deux une épaisseur égale à (1 + 2) fois celle de la première plaque biréfringente. Le second matériau magnéto-optique fait tourner le plan de polarisation dans la direction opposée à la direction de rotation du premier matériau magnéto-optique. Finalement, l'isolateur optique comporte un élément magnétisé servant à magnétiser les deux matériaux magnéto-optiques.

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