Meller Optics sapphire optics available as lenses or windows
Sapphire lenses and windows are optically clear, chemically inert, and transmit from the UV to 4.7 µm. They can be coated for >99% transmission. They have Mohs 9 hardness and can be supplied as lenses or windows, flat and stepped, concave or convex, and round or square, with mounting holes and slots.
Meller Optics
Providence, RI