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An appropriate size blank was cut using a resin bond diamond wheel on a surface grinder. The cut was made by many oscillations and slow down feed.
The long bar was then loose-abrasive-lapped on cast iron to size and, where necessary, to polish.
The concave groove was ground the length of the element using a convex formed diamond wheel.
A rotating soft-steel mandrel and 1-
A collimator was used to determine the squareness and parallelity of opposing surfaces. The silicon nitride was polished so that it gave a reflection; by comparing this with that from a target alongside any necessary corrections could be made.