The actual polygon mirror reflecting mirror metal film on a glass plate is generally a thin layer of silver, gold or aluminum.

Materials: various optical glass, fused silica UV, IR fused silica and calcium fluoride.
Focal length: ± 5mm - ± 1000mm ± 1%
OD: 5mm - 200mm ± 0.1mm
Center thickness tolerance: ± 0.05mm
Center deviation: ≤ 3 min
Surface accuracy: λ / 4 @
Surface quality: 40/20
Effective aperture: 90%
Coating: 400-700nm metal reflection film dielectric film highly reflective, near-infrared laser reflectance dielectric high reflective film may be 99.5%.