Precision Metallic Optical Coating Services Al, Ag, Au

Precision Metallic Optical Coating Services Al, Ag, Au Product Discription

Asin Optics provides high-precision metal optical coating solutions centred on aluminium (Al), silver (Ag) and gold (Au). Using physical vapour deposition (PVD) technology, we achieve controllable high-reflectivity coatings across the ultraviolet to far-infrared spectrum on a wide range of substrates.
We employ sub-nanometre-level thickness control and design dedicated protective layers and enhanced reflective coating systems for each coating stack. Whether for single-unit prototyping or mass production, we deliver precision metal-coated optical components with consistent performance and reliable longevity for applications such as laser systems, spectral analysis and infrared imaging.

Protected & Enhanced Aluminum(AL) Coating 400-1600nm 200-800nm

Aluminium coatings offer excellent reflectivity across a broad spectrum ranging from the ultraviolet to the near-infrared. For aluminium film mirrors, we offer pure aluminium film mirrors, or aluminium film mirrors coated with protective layers of magnesium fluoride and silicon dioxide. The magnesium fluoride protective layer prevents scratches and oxidation; we have optimised the design of these protective layers to maximise reflectance in the visible light wavelength range.

Protected & Enhanced Silver (Ag) Coating  450nm-20um

We manufacture total reflection mirrors using a vacuum coating process, in which a layer of silver is deposited onto the surface of a flat substrate. These mirrors offer high reflectivity across the spectrum from visible light to infrared, and are not affected by the angle of incidence.

We currently offer both pure silver mirrors and silver mirrors coated with a protective layer of silicon dioxide.

Silver-coated mirrors are suitable for high-efficiency laser mirrors, Raman spectroscopy, low-light imaging, solar concentrators, interferometers and telescope optical systems

Aluminium-coated mirrors are suitable for UV-Vis spectrophotometry, general laboratory applications, lighting systems and astronomical optics.

Protected Gold (Au) Coating 800nm-20um

Gold coatings exhibit high reflectivity in the mid-infrared to far-infrared spectrum. To enhance the adhesion between the coating and the substrate, a layer of chromium is deposited between the gold coating and the substrate. Gold-coated mirrors are suitable for applications such as FTIR spectroscopy, thermal imaging, CO₂ laser optical components, defence and aerospace infrared systems, gas sensing and cryogenic instrumentation.

Quality Assurance Of Our Precision Metallic Optical Coating Services Al, Ag, Au

Every coated component we manufacture undergoes rigorous in-process and final inspections to ensure spectral performance, adhesion and durability. Our in-house metrological capabilities include:

• UV-Vis-NIR and Fourier-transform infrared spectrophotometry
• Laser reflectance measurement
• Environmental testing in accordance with MIL-STD-810 and ISO standards
• Surface defect inspection (down to scratch/pitting level)
• Adhesion and abrasion resistance testing

A detailed coating inspection certificate is provided with every order, allowing you to integrate our optical components into your systems with confidence.

Why Choose Us For Your Metallic Thin Film Coating Components

1. We employ a specially optimised low-stress sputtering process that maintains a wavefront distortion of ≤ λ/10 after coating
2. All protective metal coatings strictly pass the tape adhesion and abrasion tests specified in MIL-C-48497A and MIL-M-13508C, and comply with the surface defect control standards set out in MIL-PRF-13830B.
3. We offer optional ultra-low scattering and high laser damage threshold designs, and are capable of handling high-energy-density laser applications.
4. We offer coating services for common optical materials such as BK7, quartz, silicon and microcrystalline glass, and can extend this to other infrared and metal substrates upon request.
5. Our processing capabilities range from micro-optical components with a diameter of 3 mm to metre-class large-aperture mirrors, and we support custom shapes and patterned designs.
6. Whether it be single-layer metal coatings, enhanced protective coatings, or complex metal-dielectric multilayer systems, we can optimise designs ranging from broadband reflectance to specific narrow-band wavelengths.
7. We offer rapid prototyping services, with the same rigorous process consistency extended to mass production.

Custom Capability Of Precision Metallic Optical Coating Services Al, Ag, Au

Application Of Precision Metallic Optical Coating

• Astronomical Telescopes

  Large-aperture mirrors require broadband reflectance approaching the theoretical limit, as well as stable surface profiles; any stress-induced warping can cause wavefront distortion and result in the loss of faint signals from celestial objects. Our low-stress sputtering processes for silver or aluminum deposition create enhanced reflective coatings with protective layers on microcrystalline glass or quartz substrates. Post-coating wavefront distortion is controlled to ≤ λ/10. This ensures stable mirror shape over long-term use, reducing the frequency of recalibration and maintenance.

• High-Power Laser Processing

  Under high energy densities, conventional metal coatings can suffer thermal distortion or even damage due to absorption, leading to downtime, lens failure, and degraded beam quality. By selecting protective silver or gold coatings with high laser damage thresholds and strictly controlling coating absorption and defect density, we can support higher laser output powers and extend the service life of optical components.

• FTIR Spectrometers and Infrared Analysis

  The mid-to-far infrared wavelength range requires an efficient, flat reflective optical path. However, standard aluminum coatings have limited infrared reflectivity, and environmental humidity can easily cause coating degradation and baseline drift. High-reflectivity gold coatings are deposited within the gold film’s operational wavelength range and can be equipped with protective layers to accommodate frequent cleaning. Combined with a spectral flattening design, this ensures stable energy across the entire wavelength range.