Optical Coatings

Optical Filter Source offers a wide variety of optical coatings. Our goal is to meet the complete optical coating needs of our customers. Here is a list of the types of coatings available:

Dichroic Filters: This includes discrete dichroic colors, edge filters, cutoff filters and C-M-Y or R-G-B color mixing sets.

Hot Mirrors: This coating is used to reflect the IR component of the spectral emission while having a negligible effect in the visible spectrum.

Cold Mirrors: This coating is used to transmit the IR component of the spectral emission while reflecting the IR component. The coating is typically used in systems at a 45 degree angle.

UV Barrier Coating: This coating is used in ultraviolet curing applications and will exhibit characteristics specific to the application.

Anti-Reflective (A/R) Coatings: These coatings enhance the transmission through the substrate by attenuating the reflection off of the substrate surfaces. OFS provides custom AR coatings from SLAR, V-coat, U-Coat and broad band coatings. Applications are as numerous as wavelengths.

High Reflective Coating: Some applications require a very high reflectance at a certain wavelength. HR coatings are custom designed to account for reflectivity, transmission, phase angle or polarity.

ITO Coatings: These coatings are electrically conductive, transparent (when compared to other metals) and can be etched. The innovation behind this coating is that it has the properties of both a metal and a refractory oxide. They are used in flat panel displays and other applications where electrical current must be routed without significantly degrading transmission. OFS provides a variety of options in ITO coatings, including index matched and anti-reflective ITO coatings.

Neutral Density Filters: Neutral density (ND) coatings decrease the intensity of light without significantly altering the relative spectral distribution of the energy. An ND filter is used to filter the entire visible spectrum evenly, allowing light reduction, without influencing color or contrast. Attenuation is accomplished by using a thin-film metal coating that combines absorption and reflection. ND filters obtain their optical density by depositing a metal alloy coating onto a specific type of substrate, which is determined by the wavelength region of interest. ND filters are designed for your application. The amount of attenuation is produced according to specification.

Diamond Like Carbon (DLC) Coatings: DLC coatings are the most durable coating available. New applications for DLC coatings are still being discovered. Current DLC coatings address durability and lubricity. Development of optical DLC technologies is being considered.