Optical flat: High accurate of the surface for single or both sides. Processed by the optical grade glass,used as a stardard for interferometer, to create the interference fringes by comparasion. Ideally used in laboratory interferometers or quality checking as the stardard. Mostly they are made from Fused Silica or BK7 optical glass, to make sure its long term thermal stability and accuracy. L/10-L/20 as the flatness as PhyO can reach for single sides or both sides polishing. Tiny protect chamfer and stardard surface quality.
Optical Windows
