Materical

BK7 ,k9,sapphire,Ge,Si,Caf2 Mgf,Znse GaAs,Zns

Angle tolerance

5''-3'

Surface quality

85/50,60/40,40/20

Angle accuracy

<10 arc sec

Dimension tolerance

+/-0.01mm

flatness

1/4@633nm

Clear aperture

>90%

Bevel

0.1mm-0.5mm

coating

Gold coating, AR, HR, PR coating, etc.