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Applying protective, anti-reflection, filter and mirror coatings by physical vapor deposition to lenses, imaging elements for photonic systems, laser crystals, non-linear optical crystals for frequency conversion, fiber optic cables, lighting fixtures, liquid crystal display projectors, laser pointers, laser writers, laser diodes, LED lighting, lasers for industrial use, lasers not for medical use, lasers for medical purposes, eyeglasses, protective glasses, reading glasses, sun glasses, magnifying glasses for medical purposes