Meller Optics has introduced custom fabricated sapphire windows--18-in. dia. X 0.4-in. thick--for use in military navigation and targeting systems. This size provides transmitted wavefront of 0.4-wave, parallelism to 2 arc-sec. and a 70:1 aspect ratio. They are designed for use as pilot, instrument, and weapon systems viewports due to their durability and high accuracy, according to the company. Featuring Moh surface hardness for optimum abrasion resistance, they have surface finishes of ...

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