Optical windows for aerospace applications encompass precision-ground and polished transmissive elements manufactured from infrared-grade germanium, zinc selenide, fused silica, calcium fluoride, and synthetic sapphire, used in electro-optical (EO), infrared (IR), and laser systems; fabrication involves single-point diamond turning (SPDT), controlled optical coating deposition, and stringent surface-figure and wavefront-error verification to MIL-SPEC tolerances.
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