The aluminum mirror is a total reflection mirror formed by coating a layer of aluminum film on the surface of the flat substrate by vacuum coating method. These products have high reflectivity from visible light to infrared and are almost independent of incident angle. Pure aluminum mirrors and aluminum mirrors covered with MgF2 or SiO2 protective film are available. MgF2 protective film prevents scratches and oxidation. But its reflectivity is lower than that of pure aluminum film. Aiming at the maximum reflectivity in the visible wavelength band, the MgF2 protective film was optimized.
Features of aluminized mirrors:
The mechanical hardness of the surface of the film is not high, the protective aluminum film (Al+MgF2) can be cleaned with a cotton swab containing organic solvents, but the pure aluminum film (ordinary aluminum film) is relatively soft and cannot be wiped, and needs to be replaced regularly
Reflectivity index of aluminized mirror (for reference):
|Items||200 ～ 400nm||400 ～ 700nm||700 ～ 1000nm|
|Al||Ravg≥ 85%||Ravg≥ 90%||Ravg≥ 90%|
|Protected al+MgF2||Ravg≥ 85%||Ravg≥ 80%|
Referance of Coating Curve