Specifying Coatings | NTFL Coating Experts
Specifying Coatings

It is important to fully specify your requirements for optics and coatings in order to ensure that you receive the components that will work optimally for your system at the lowest cost. In other words, taking some time in specifying coatings will ensure you get the best product at the best price. There are a number of considerations in specifying optical components that are specific for both optics and coatings.

When specifying optical coatings, please include the following information (as applicable):

– The reflectance and/or transmittance in the areas of concern. Wavelength regions that are unspecified are assumed to be unrestricted (i.e., any performance is acceptable). Please indicate what tolerances are acceptable for the reflectance and/or transmittance specifications requested.
– The angle of incidence or range of angles of incidence over which the reflectance/transmittance requirements apply.
– The polarization of the incoming radiation if the angle of incidence is not normal to the surface to be coated (if applicable).
– The substrate material.
– The number and size of the substrates to be coated.
– The maximum temperature that the substrates can tolerate if the temperature limit is under 400C.
– The maximum tooling mark and the preferred locations of the tooling marks on the substrates to be coated. Please note that the tooling marks will be small regions on the optical surface(s) that will not get coated. Full clear aperture is available on many substrate shapes and sizes, but requires special tooling.
– Any areas on the substrates that must be masked (i.e., remain uncoated).

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