Specifications:Standard Windows1. Material: H-K9L or Fused Silica2. Surface Quality: 60/403. Surface Flatness: λ/4@633nm4. Wedge: 3 arc min5. Clear Aperture: ≥central 80% of diameterHigh Precision Windows1. Material: H-K9L or Fused Silica2. Surface Quality: ≤10/53. Surface Flatness: ≤λ/10 or TWD ≤λ/10 @ 633nm4. Wedge: ≤5 arc sec5. Clear Aperture: ≥central 80% of diameterWindows Code: WIN+Material Code-Size- Surface Quality- Surface Flatness - Wedge -CoatingPlate Code: PLA+Material Code-Size- Surface Quality- Surface Flatness - Wedge -Coating