Thin Film Coatings: Custom
For information on our pre-defined standard coatings, see our Thin Film Coatings: Standard page.
Thin film coatings are extremely thin layers of materials (such as TiO2, SiO2, MgF2, gold, aluminium etc.), which can be applied to the surface of a substrate like glass, metal, crystals, or ceramics, to effect a change in its optical properties. Effects such as reflection, refraction, anti-reflection and conductivity can be produced and modified by expert calibration of material selection, the number of coating layers, and the respective thicknesses of each thin film layer, all in relation to the incidental wavelengths of light.
Reynard Corporation is regarded as one of the world's leading production facilities for the designing and manufacturing of thin film coated optical components. We have 20 vacuum coating chambers and over 28,000 square feet dedicated to the manufacturing of the highest quality optical components. Leveraging our experience from over tens of thousands of successfully implemented coating designs, we are able to meet the most stringent requirements of today's applications.
Custom Optics is a Key Part of Reynard Corporation's Business:
At Reynard, well over 80% of our business is optical design and manufacturing based on custom requirements. Our design engineers will evaluate your requirements and provide a coating solution for your review. The coatings are deposited on either a standard, stock blank substrate or on a substrate supplied by the customer. The designer will need to know the details, such as substrate material and the surface finish, prior to the deposition process. If you are looking for a fully customized optical component, including substrate and thin film coating, see our Custom Optical Components page.
An introduction to some of the coating types that we offer are shown in the sections below.
Reynard Corporation provides a range of Anti-Reflection Coatings (AR) that are used to enhance the transmission characteristic of an optically finished substrate. Our leading edge capabilities support the design, manufacturing, and verification of AR coatings designed for use at any combination of temperature, wavelength, angle of incidence, polarization, and laser power from 0.2 to 25µm. All standard AR coatings can be customized for your particular application. More...
Band Pass Filter Coatings
Band Pass Filter (narrow) and Band Pass Filter (wide) coatings are used to create a type of wavelength selection filter operational over a specified wavelength band from the UV to the far IR. A Band Pass Filter allows only the wavelengths in the specified range to pass through the filter, while blocking wavelengths outside of the transmission region with high rejection ratio. A Band Reject Filter blocks a specific wavelength range with high rejection ratio, while transmitting wavelength regions on either side of the rejection region.
Bullseye® Apodizing Filters Coatings
Bullseye® Apodizing Filters Coatings are a part of the Bullseye® apodizer line of customizable gradient filters used to eliminate undesirable intensity variations in optical systems. The custom specified density function can either decrease (dark-to-light) or increase (light-to-dark) radially from the center of the substrate. More...
Attenuation Filter Coatings
Attenuating Filter Coatings, at the most basic level, are thin film coatings, which reduce the amount of light energy transmission in an optical system. For static applications, a fixed ND (neutral density) filter provides a constant level of transmission over a wide wavelength band. A more complex variable (or gradient) filter provides a density change over a custom defined region. The variable function can be defined as linear, circular, or radial depending on the substrate needs, and in either continuous or step.
Thin film Conductive Coatings can be applied as a uniform plane across a substrate, as bus bars on the sides of a substrate, or as a custom pattern with geometries down to 10um. Various metals can be used depending on the wavelength range of required performance. Transparent Conductive Coatings are also deposited utilizing thin metals or specially designed materials, such as ITO or AZO. More...
Dichroic Filter Coatings (also known as Color Separation Filter Coatings):
Dichroic Filters are sometimes known as color separation filter coatings because their purpose is to separate incoming light into distinct wavelength regions. Commonly used to extract a narrow wavelength band for entertainment or lighting effects, they can also be used as hot mirrors or cold mirrors to separate infrared light from visible light. Dichroic coatings achieve color or wavelength separation with a much higher degree of accuracy than conventional filters.
Infrared Thin Film Coatings
Infrared (IR) Coatings effect light that extends from the edge of visible red (700nm) to the far infrared (approximately 50um for Reynard Corporation capabilities). Any type of filter (LWP, SWP, BP, etc) or mirror coating that can be produced in the visible spectrum can also be implemented to work in the infrared. The difference in design is the starting choice of substrate and coating materials used to implement the required function, as reflection and transmission characteristics of individual materials change dramatically at different wavelengths. Reynard Corporation is highly experienced in the design and manufacturing of IR filters and mirrors.
Laser Protection Thin Film Coatings
High performance thin film Laser Protection Coatings, are designed to withstand higher energy conditions than classical thin film designs. Improved performance comes from the use of material sets with low absorption and higher melting points as well as through process improvements, such as the use of IAD.
Longwave Pass Coatings (LWP)
Longwave Pass Dielectric Coatings (LWP) are used to create a type of wavelength selection filter operational over a specified wavelength band from the UV to the far IR. Wavelengths smaller than the filter transition point are blocked with a high rejection ratio, while wavelengths longer than the transition point are transmitted. The transition point is application specific and static as defined by the customer. More on Longwave Pass IR filters and Longwave Pass VIS filters...
Multi-Band Thin Film Coatings
Multi-Band Thin Film Coatings are used to create a type of wavelength select filter operational over customized distinct wavelength bands from the UV to the far IR. The filters are custom designed for applications that require multiple transmission or rejection bands that are non-contiguous. A filter that transmits the 3-5um (MWIR) band as well as the 8-12um (LWIR) band, while blocking the regions in or around these transmission bands is an example of a multi-band filter.
Short-wave Pass Coatings (SWP)
Short-wave Pass Dielectric Coatings (SWP) are used to create a type of wavelength selection filter operational over a specified wavelength band from the UV to the far IR. Wavelengths smaller than the filter transition point are transmitted, while wavelengths longer than the transition point are blocked with a high rejection ratio. The transition point is application specific and static as defined by the customer. More on Shortwave Pass Filters IR and Shortwave Pass Filters VIS...
Trichroic Filter Thin Film Coatings
Trichroic Filters are used to precisely split incoming light into three separate wavelength bands of red, green, and blue, or alternatively to recombine such bands. Applications for Trichroic Filters include multi-sensor camera systems, where the three separated bands are detected by three separate CCD arrays, and projectors, where the Trichroic Filter recombines the red, green, and blue light sources into the presentation image.
Ultraviolet (UV) Filter Thin Film Coatings
Ultraviolet (UV) AR Thin Film Coatings are designed to work over shorter wavelengths from the edge of the visible spectrum (400nm) down to 180nm. Any type of filter (LWP, SWP, BP, AR, etc) or mirror coating that can be produced in the visible spectrum can also be implemented to work in the UV. Other UV thin film coatings are UV Enhanced Aluminum Metallic coating and UV Protected Aluminum Metallic coating.
Visible Thin Film Coatings
Visible Thin Film Coatings in the visible spectrum cover the wavelength range from 400nm to 700nm, which correspond to the spectrum detected by the human eye. Coatings by Reynard Corporation modify the transmission and/or the reflection characteristic of an incident light source to produce a desired effect. Thin film designs can be specified as part of our large selection of standard types or customized for application specific requirements. Types of coatings offered include, but are not limited to, longwave pass (IR), longwavepass (VIS), shortwave pass (IR) , shortwave pass (VIS) , dichroic, variable, anti-reflection (AR), and mirror coatings. More...
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