Patent ID: 8565561
Filing Date: 2013-10-22
Classification: G02B,G02F

Abstract:
1. A polarization independent optical isolator comprising: a pair of wedge-shaped birefringent crystal plates placed on an optical path; a Faraday rotator which is placed, on the optical path, between the wedge-shaped birefringent crystal plates and which is made of a magnetic garnet single crystal; collimator lenses which are placed, on the optical path, at positions outside the respective wedge-shaped birefringent crystal plates in relation to the Faraday rotator taken as a center; and sapphire single crystal plates bonded to light transmitting surfaces of the Faraday rotator, respectively, wherein the pair of wedge-shaped birefringent crystal plates are each made of a YVO a light transmitting surface of each of the sapphire single crystal plates is formed in such a manner as to be parallel to a non-inclined light transmitting surface of a corresponding adjacent one of the wedge-shaped birefringent crystal plates, and to be offset from a c-plane of the sapphire single crystal plate, and the polarization independent optical isolator is set to satisfy the following conditions: