What substrates do you accept for coating services?

Most optical materials can be coated, including common optical glass, Si, Sapphire, SiC, Ge, and more.

Can you provide both single-layer and multi-layer coatings?

Yes, Bena Optics can meet various custom coating needs, including single-layer and multi-layer bandpass coatings.

Bena Optics uses physical vapor deposition (PVD) in a vacuum environment.

Bena Optics uses a Hitachi spectrophotometer for coating testing, covering a range of 180nm to 2900nm.

Yes, when extremely high reflectivity is required, metal plus dielectric coatings may be used based on product application needs.

Yes, we can accommodate large-size mirror coatings.

Anti-Reflection Coating (AR)
To fully enhance the transmittance of specified light waves, covering the ultraviolet, visible, and infrared spectra, we offer solutions that include single-wavelength bands, bandpass filters, single-layer coatings, and multi-layer coatings. Our products are designed to meet customized requirements.

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Dielectric Coating
Electrolyte coatings feature ultra-high reflectivity and minimal absorption, providing optimal solutions for optical requirements. They are widely used in laser applications and other high-demand systems.

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Metal Reflect Coating
Bena Optics offers various coatings of metals such as Al, Ag, and Au, including protective and enhanced coatings. These coatings exhibit excellent reflective properties, effectively reflecting light. Metal reflective coatings are widely used in optical instruments, lighting equipment, and other fields.

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Types

Metal reflective films (Al for UV/visible, Ag/Au for IR) with protective dielectric layers (SiO, MgF₂).

All-dielectric films using high/low refractive index stacks (λ/4 thickness).

Mechanisms

Metal films leverage high extinction coefficients to reflect ~90% light, while dielectric films rely on multilayer interference for >99% reflection.

Applications

Aluminum foil composites reflect 93% radiant heat for building insulation.

Laser optics use Au/Ag coatings for broad-angle reflectivity (e.g., CO₂ laser mirrors).

Limitations

Metal films suffer oxidation (requiring protective layers) and limited peak reflectivity (~90%)

Principle: Reduces reflection via destructive interference between reflected light waves from coating interfaces

Design: Single-layer for narrowband (e.g., λ/4 thickness); multi-layer (e.g., double/triple) for broadband/low reflection

Materials: Modern crystalline silicon PV uses Si₃N₄ (high refractive index, PECVD-deposited); early PV used SiO₂/TiO₂

Applications: Optical lenses (e.g., reduced glare); solar cells (↑ light absorption, ↑ efficiency by ~4%)

Q. What substrates do you accept for coating services?

A.

Most optical materials can be coated, including common optical glass, Si, Sapphire, SiC, Ge, and more.
Q. Can you provide both single-layer and multi-layer coatings?

A.

Yes, Bena Optics can meet various custom coating needs, including single-layer and multi-layer bandpass coatings.
Q. Does Bena Optics use physical vapor deposition (PVD) or sputtering for coatings?

A.

Bena Optics uses physical vapor deposition (PVD) in a vacuum environment.
Q. How do you test the coatings?

A.

Bena Optics uses a Hitachi spectrophotometer for coating testing, covering a range of 180nm to 2900nm.
Q. Can you provide metal plus dielectric coatings?

A.

Yes, when extremely high reflectivity is required, metal plus dielectric coatings may be used based on product application needs.
Q. Can you handle large-size mirror coatings?

A.

Yes, we can accommodate large-size mirror coatings.