Round Broadband Protected Aluminum Mirrors
The product shown in the image is a set of round, flat optical mirrors with a metallic (silvery-gray) reflective surface and a precision-polished edge. Based on the visual characteristics, these are broadband protected aluminum mirrors, consisting of an optical-grade substrate (typically BK7 or fused silica) coated with an aluminum reflective layer and a protective dielectric overcoat (e.g., SiO2). The protective coating prevents oxidation and scratches while maintaining high average reflectance across the visible and near-infrared spectrum. These mirrors are available in multiple standard diameters and thicknesses, making them suitable for general beam steering, folding, and reflection tasks in laser systems, imaging devices, and optical instruments where broadband, cost-effective reflection is required.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Substrate Material | BK7 / Fused Silica |
| Coating Type | Protected Aluminum (Al+SiO₂) |
| Diameter | Ø12.7mm / Ø25.4mm / Ø50.8mm |
| Thickness | 3mm / 6mm |
| Thickness Tolerance | ±0.2mm |
| Surface Flatness | λ/10@632.8nm |
| Surface Quality | 40-20 Scratch-Dig |
| Parallelism | ≤3arcmin |
| Average Reflectance | Ravg>90%@400-700nm |
| Reflectance (NIR) | Ravg>95%@700-2000nm |
| Clear Aperture | >90% |
| Bevel | 0.2-0.5mm×45° |
| Laser Damage Threshold | >0.3J/cm²@1064nm,10ns |
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