The Electron Beam Physical Vapor Deposition (EBPVD) technique is our standard coating technique:
Technical Description
A heated filament emits the coating electrons, which accelerate in the magnetic field and towards the anode. This high energy bombardment releases the target coating molecules.
Traveling outward, they form a thin uniform layer on the lens surface.
The pressure of the chamber is of the order 30 ATM.
The target lenses are kept on top of the mount.
The mount rotates to ensure uniform deposition. Only one side of the lens surface is coated at a time.
Coating materials are required “stacked” in a specific order to ensure adherence and durability.