Glass: optical sapphire

Diameter: 7.5mm +0/-0.1

Thickness: 0.7mm +0/-0.02

Surface quality: 60-40

Parallellism: 1 arc min

Flantess: 1 fringe

Nanjing China

Paymenter: T/T

Trade terms: FOB Nanjing

Optical window is an optical grade piece of glass lapped and polished to be extremely flat on one or both sides. Optical flat or window is used with a monochromatic light to determine the flatness of other surfaces.