An Optical Window is a mechanically flat, sometimes optically flat, depending on resolution requirements, ) piece of transparent (for a wavelength range of interest, not necessarily for visible light) optical material that allows light into an optical instrument. A window is usually parallel and is likely to be anti-reflection coated, at least if it is designed for visible light. An optical window may be built into a piece of equipment (such as a vacuum chamber) to allow optical instruments to view inside that equipment.
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(Sterling Precision Optics, Inc.)
Evanston, IL 60202 map, United States
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