METHOD OF PRODUCING SHALLOW LEUCOSAPPHIRE LENS WITH MINIMAL BIREFRINGENCE Russian patent published in 2017 - IPC G02B1/02 G02B1/08 

FIELD: physics.

SUBSTANCE: method comprises preparing of concave-convex workpiece by plastic deformation of crystal Z-cut parallel-sided plate bending. The inital parallel-sided plate with a diameter D which is greater than 1.5d lens diameter and with a thickness H = 2h, where h is lens thickness, is deformed with a punch with radius R = ((d/2)/0.3)-H. Lens is formed in the form of a parallel-sided plate using methods of removing material excess layer from the workpiece. Incoming lens surface is formed on the convex side of the workpiece by removing S of its thickness along the symmetry axis perpendicular to the latter. On the concave side of the workpiece center point on the second lens flat surface must be located on the symmetry axis of the workpiece. Then the detail is rounded to d mm lens diameter, combining the symmetry axis of the workpiece and the optical axis of the lens.

EFFECT: producing a minimal birefringence for a parallel light beam directed perpendicular to the incoming surface of the lens.

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