An optical window is an observation interface that separates two environments while allowing the chosen light to pass through. Made of a material that can be transparent, the optical window is designed to maximize transmission in a certain spectrum (ultraviolet, visible, infrared) while minimizing light reflection and absorption. This is the result of the choice of material-specific mechanical and optical characteristics.
It can be dedicated to the protection of equipment by limiting the impact on incoming and/or outgoing optical signals. The optical window can also be used as a viewing and/or measuring lens while preventing external elements such as water, dust or air from coming into contact with the inside of the equipment.
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Two types of optical windows can be distinguished:
The optical window can have different shapes (round, rectangular, oval or freeform) depending on its use and the application medium. Industry (aeronautics, defence, security, transport, petrochemicals, etc.), research institutes, private or public laboratories use optical windows to conduct tests, carry out measurements, inspections or to carry out work in the field of spectroscopy (UV) and thermography (IR).
To respond effectively to the expected use and the targeted spectral range, the selection of the material is crucial. It will be chosen from three main categories: Categories: Glass, Polymer or Crystal. Let&#;s take a look at the main characteristics of these families of materials.
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