When in use, lasers emit radiation at specific wavelengths and sometimes several wavelengths simutaneously. Safety eyewear with the correct filter is nessessary to protect eyes from wavelengths that can cause damage to the eyes. Safety glasses and goggles fitted with filters prevent the damaging wavelengths from reaching the eyes while allowing normal light to pass through so the user may still clearly see their work.
There are two basic types of laser protection filter technologies: Absorption and Reflection.
The the protective medium captures the energy of the laser which is then transformed into heat. The heat is then dissipated by the surrounding materials.
Laser radiation directed at the filter bounces off in a different direction, often in a broad, scattering pattern. Reflective laser safety coatings are known as thin film coatings, metallic film coatings, dielectric films and dielectric interference coatings. Multiple layers of specially selected materials are applied to a substrate under vacuum conditions. A custom designed interference pattern is created to reflect only the desired wavelengths and allow remaining light to pass through.
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