An optical glass window is a piece of glass that has been specially manufactured for use in optical applications. Optical glass is made from a specific type of silica sand, which is heated and cooled very slowly to create a very pure, homogeneous glass.
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This type of glass has very low levels of impurities, which makes it ideal for use in optical applications where light needs to be transmitted with minimal distortion. Optical glass is also very resistant to thermal shock, meaning it can withstand sudden changes in temperature without shattering. Glass windows are used in a wide range of optical devices, including telescopes, cameras, and binoculars. They are also used in some types of medical equipment, such as x-ray machines.
How to choose an optical window?
What is an optical window?
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.
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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.
Two types of optical windows can be distinguished:
- Plane parallel windows: used to reduce the distortion of a beam of light transmitted by a specific wavelength
- Prismatic windows: used to direct transmitted light at a specific angle and reduce rear reflection.
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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