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A dielectric mirror, also known as a Bragg mirror, is a type of mirror composed of multiple thin layers of dielectric material, typically deposited on a substrate of glass or some other optical material. By careful choice of the type and thickness of the dielectric layers, one can design an optical coating with specified reflectivity at different wavelengths of light.
Optical glass such as K9, fused silica, sapphire, MgF2, silicon (Si), ZnSe, ZnS, etc. These materials possess high transmittance, low absorption, low scattering, uniform refractive index, and specific dispersion characteristics.
Precisely hemispherical. The machining precision of the center and radius of curvature of the sphere is extremely high.
The surface is precision polished to an optical grade of 10-5 to ensure image quality and reduce scattering and aberrations.
An AR coating is typically applied to the concave surface to maximize the transmittance of specific wavelengths of light (e.g. visible light) and reduce reflection loss.
| Structure | Flat, Sphere, Cylinder, or customized shape |
|---|---|
| Substrate | Fused silica/ Silica/ BK7 Glass |
| Dimension | 2mm~100mm |
| Clear aperture | >90% of dimension |
| Surface quality | 40/20, 20/10 Scratch-Dig |
| Surface Irregularity | λ/2~λ/10 @632.nm |
| Thickness | 1mm~20mm |
| Coating | UV/ VIS dielectric coating |
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