Aluminum Coated Mirrors

Product Overview

Using advanced vacuum deposition technology, these mirrors feature a thin aluminum layer (typically 0.1–0.2 μm thick) protected by a dielectric SiO₂ overcoat, ensuring both high reflectivity and oxidation resistance . With >90% reflectance in the 230–600 nm range and stable performance over 7–10 years under normal conditions, they outperform uncoated alternatives in durability and optical efficiency . These mirrors are foundational in laser systems, astronomy, and industrial imaging, where reliable light redirection is critical.

Product Features

Optical Efficiency

Broadband reflectivity: >85% from 200 nm to 950 nm and >92% for wavelengths >1 μm, with custom optimization available for specific bands like 266 nm or 800 nm .

Low scattering losses: Total scattering (TS) <100 ppm at 633 nm, ensuring minimal signal degradation in precision measurements .

Durability & Protection

SiO₂ protective layer prevents oxidation, extending lifespan to 10+ years in shielded environments like telescope OTAs .

Resistant to humidity and temperature fluctuations (-40°C to 80°C), suitable for outdoor and industrial settings .

Engineering Flexibility

Lightweight design: Aluminum substrates weigh 18% less than copper equivalents, ideal for dynamic systems like laser cutting heads .

Custom shapes (flat, curved, variable-radius) and sizes (10 mm to 500 mm) accommodate OEM integration .

Applications

Laser Systems

High-power lasers (up to 20 kW) use aluminum mirrors for beam steering in metal cutting and welding .

UV lasers (193 nm) rely on optimized coatings with >75% reflectance for semiconductor lithography .

Astronomy & Imaging

Telescope mirrors maintain >90% reflectance for visible light, supporting deep-sky observation .

Spectrometers use aluminum coatings for consistent wavelength response .

Solar & Industrial

Concentrated solar power (CSP) systems utilize high-reflectivity mirrors to focus sunlight .

Machine vision setups employ aluminum mirrors for precise image alignment .

FAQ

Q1: How often do aluminum coatings need reapplication?

A1: Under typical conditions, coatings last 7–10 years; enhanced versions in shielded environments may exceed 15 years .

Q2: Can these mirrors withstand cleaning?

A2: Yes, using mild detergents and soft cloths. Avoid abrasive tools that damage the SiO₂ layer .

Q3: What causes reflectivity degradation?

A3: Oxidation over time reduces reflectivity by ~0.5% per year; environmental dust accelerates this process .

Q4: Are custom coatings available for specific wavelengths?

A4: Yes. Coatings can be optimized for bands like 248 nm (>90% reflectance) or 157 nm (up to 94% with dielectric enhancement) .