Optical Sapphire Windows

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Optical Sapphire Windows
In optics, it means a (usually at least 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.
Sapphire is one of the hardest materials, and possesses very good transmission during the range of visible and near IR spectrum. It is widely used as optical window in infrared and far infrared military equipments, apparatus and instruments of satellite and space technology, and navigation and spaceflight, such as night infrared scope/sight and night vision camera, etc. The sapphire windows are intensively applied in high-tech fields.
Circular Windows are applied to isolate different physical environments while allowing light pass. When selecting windows, please consider materials, transmission, scattering, parallelism and resistance to certain environment.

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