Plane Windows are used as substrates for a variety of applications, such as laser window, output couplers, beamsplitters, beam combiners, mirrors, dichroic filters and plate polarizers. Considerations in selecting window substrates include transmission range, absorption coefficient, incident laser power density and environmental factors such as pressure, temperature, moisture, abrasion and corrosion. Plane Windows listed under UV / VIS / NIR substrates are specified for applications involving coating wavelengths 193nm ≤ λ〈2.0 μm. Units for these substrates are given in mm. Plane Windows listed under IR substrates are specified for applications involving coating wavelengths λ≥ 2.0 μm. Units for these substrates are given in inches. 
Refer to the THIN FILM COATINGS section for information on coatings that can be applied to these substrates.