Mirrors

Mirrors with highly reflective coatings increase reflection

Surface mirrors are manufactured by depositing a metal layer or by employing dielectric layer systems. These coatings are also known as highly reflective (HR) coatings. Mirror coatings are designed to enhance reflection within specific wavelength ranges while concurrently minimising transmission.

Optical mirrors serve not only to reflect light, but also to regulate the intensity of radiation. Their individually adjustable reflection and transmission properties render them suitable for a broad spectrum of applications. Optical coatings typically consist of one or more layers applied to the substrate with varying thicknesses. At Bte, we provide a wide range of mirror coatings tailored to meet different optical requirements.

This enables us to produce metal mirrors that function over a very broad spectral range. We also manufacture dielectric mirrors that offer higher reflectivity over defined, even shorter wavelength ranges.

Mirror coating

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Metal mirrors

Highly reflective coatings or mirror coatings are produced using metallic mirrors

Bte Born - aluminium mirror / aluminum mirror Bte Born - copper mirror Bte Born - dielectric mirror

Highly reflective coatings, commonly known as mirror coatings, are often accomplished using metallic mirrors. These metallic layers, or metallic mirrors, are created through a process called Physical Vapour Deposition (PVD) coating. During PVD coating, high-purity metals are evaporated within a vacuum environment and subsequently deposited as thin layers onto the substrate. Depending on the chosen coating material and the thickness of the layers, both mirrors and absorbers as well as partially transparent surfaces can be achieved. The resulting metal mirrors are also known as metal reflectors.

In most cases, transparent protective layers are added to the metallic coatings. These layers prevent subsequent oxidation of the metallic layers and enhance both reflection and resistance to mechanical damage. 

Moreover, exceedingly thin metallic layers can be deposited onto transparent substrates to generate partially transparent coatings or beam splitter coatings.

Dielectric protective coatings for metallic mirrors

  • Dielectric coatings are typically applied to metallic mirrors (aluminium mirrors, copper mirrors, silver mirrors, front surface mirrors, back surface mirrors, metal reflectors, etc.). They protect the metallic reflective layer and increase the durability of the mirrors.
  • These protective layers do not affect the reflective properties of the metallic mirror layers.
  • Additional dielectric layer packages such as UV or IR-enhanced can be applied to increase reflectivity in certain areas (enhanced metal mirrors or enhanced metal reflectors).

Overview metallic mirrors

More about the different kinds of metallic mirrors

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Dielectric mirrors

Dielectric mirrors for the directing, modifying and imaging of light beams

Compared to metal mirrors, dielectric mirrors, also known as interference mirrors, typically encompass narrower spectral bandwidths.

More about dielectric mirrors, including highly reflective mirrors and cold light mirrors

Highly reflective mirror

Comparison of metallic and dielectric mirrors

metal mirrors compared to dieletric mirrors

Functional coatings

Functional coatings achieve properties such as sinterability, solderability or electrical insulation

Functional coatings play a vital role in achieving specific properties such as sinterability, solderability, or electrical insulation, enhancing the functionality of surfaces. At Bte, we offer a diverse range of functional coatings tailored to meet various requirements.

Functional coatings that we apply include, for example: 

  • Chromium (Cr) 
  • Nickel (Ni)
  • Copper (Cu) 
  • Titanium (Ti)
  • Gold (Au)
  • Silver (Ag)
  • Tantalum (Ta)
  • Aluminium (Al)
  • Rhodium (Rh)
  • Indium (In)
  • Combination layers of the above, such as nickel-chromium (Ni-Cr), iron-nickel-chromium (FeNiCr)

These functional coatings serve multiple purposes, including improving sinterability, solderability, or electrical conductivity. They facilitate bonding processes, such as the attachment of power modules, or printed circuit boards to heat sinks through methods like sintering or bonding. Moreover, functional coatings contribute to electrical insulation and shielding against electromagnetic interference waves.

Furthermore, they address thermal management concerns by optimising heat dissipation and thermal conductivity. Functional coatings can also be utilised to create adhesive layers and composite structures, enhancing overall performance and versatility.

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