Special Optical coatings

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Capability

Diamond Coatings offer a broad variety of special (in optical and infra-red) optical coatings using semiconductor and oxide layers with an approximate wavelength range of 300 nm to 20 microns. Samples of optical coatings we can provide are shown below. If you can’t find anything matching your exact requirements, please contact us.

Optical Coatings Available Include

Optical Coatings Options

Available options for optical coatings, all of which are available in infra-red, near-infra red and the visible range, include:

• Anti-reflection coatings (Broadband AR and V coats) providing highly efficient AR featuring reflections below 0.5%

• Beam Splitters offering a range of values for Transmission/Reflection (i.e. 70/30 or 50/50 +/- 1.5%)

• Front Surface Mirrors offering reflection exceeding 99%

• Filters blocking infra-red (hot mirrors)

• Edge, Bandpass and Narrow Band Filters

Substrates Available Include

Available substrates include a broad range of optical polymers, glasses and sapphire.

Usually utilized for specific laser wavelengths, ‘V’ Coat AR coatings can be designed to suit a range of different incidence angles. Reflections below 0.1% (single wavelength) can be achieved for ‘V’ AR coatings.

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Broadband multi-layer AR coatings offer average reflection of below 0.5% over a broad range of wavelengths within visible, infra-red and UV regions. We can design broadband multi-layer AR coatings for a wide range of substrates; performances, incidence angles and wavelengths. Our capabilities also extend to the design of dual band AR coatings.

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Reflecting a portion of incident light and transmitting the remainder, Beamsplitters are most commonly used at an incidence angle of 45 degrees. We do, however, have the ability to design beamsplitters suitable for other incidence angles.

For angular insensitive, simple requirements, it is possible to use metal coatings, providing comparatively large absorption amounts are acceptable. Spectrally flat transmission/ reflectance curves over a bandwith of approximately 300 nm can be provided by all dielectric designs.

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Employing a design similar to that of all-dielectric high reflectors enables achievement of short or long wave pass filters for a variety of incidence angles.

Used to reflect one incident spectrum portion and transmit another, these filters can be employed to transmit the visible and reflect the infra-red (commonly referred to as ‘hot mirrors’) or reflect the visible and transmit the infra-red (commonly referred to as ‘cold mirrors’). Applications also include use of these filters as ultra-violet light or colour filters.

We can design and manufacture edge filters for a variety of incidence angles.

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Durability

Depending on specific deposition process and design, our AR coatings typically meet all cosmetic and durability requirements of MIL-C-675, MIL-M-13508 and other common optical specifications.

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