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Focusing lenses and mirrors replace CO2 lasers for engraving and cutting. Manufacturer�fs CO2 lenses and mirrors are optimized for use at 10.6 �åm where depth-of-field is important and will fit popular low-power cutting lasers. Offered in 12- to 112-in. diameter with focal lengths from 1 to 25 ins., in -in. increments. Mirrors and reflectors are 12 in. to 3 ins. in diameter, from 2 to 10 mm thick, and come in silicon, molybdenum and copper. Remounting service available. Laser Research Optics, Providence, R.I.