Patent ID: 6628461
Filing Date: 2003-09-30
Classification: G02B,G02F

Abstract:
An optical device comprising:a first birefringent crystal wedge having a wedge angle &thgr; optically configured to receive two rays incident at an angle &ggr; with respect to one another; a rotator configured to rotate said two rays received from said first birefringent crystal wedge; and a second birefringent crystal wedge also having the wedge angle &thgr; positioned to receive said two rays from said rotators, wherein said optical device is configured to combine said two rays in a first direction, and isolate said two rays in a second direction and wherein the relationship between the wedge angle &thgr; and the angle &ggr; is defined as &ggr;=2Â·arcsin ((noâˆ’ne) tan&thgr;), where no and ne are the refractive indices of the first birefringent crystal wedge and of the second birefringent crystal wedge, respectively.