Coating Optical Windows and Glasses

Optical coatings are deposited on optical windows to modify the reflection/transmission properties of the surface of the optical element. Only a few percent of the incident radiation is typically reflected light. For transmitting reflected optics, it is generally required for reflected portion of incident light to approach 0% and 100% for reflective optics. For reflectors with an intermediate value a beam splitter would be used, these would be custom made to specification. Optical coatings to improve the optical window to reduce the reflection are coated with a single layer or multi-layer anti-reflection coating for transmitting for broadband and a ‘v’ coating for specific wavelengths or dual wavelength.