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Optical flats

  • Optical flats

    Fused silica optical flats are used as a reference when measuring the flatness of unknown surfaces. BK7 plates are also available for lower requirements. Each standard product is available in BK7 or fused silica and machined on one or both sides.
      • Diameter 25 mm (thickness 12.5 mm)
      • Diameter 50 mm (thickness 15 mm)
      • Diameter 100 mm (thickness 20 mm)
      • Diameter 150 mm (thickness 25 mm)
      • Diameter 200 mm (thickness 38 mm)
    • MaterialBK7Fused Silica
      Sizes25 mm to 200 mm25 mm to 200 mm
      Flatnessλ/4λ/10, λ/20
      Back surface (single)1 to 2 λ @ 633 nm1 to 2 λ @ 633 nm
      Surface quality60/40 scratch/dig60/40 scratch/dig
      Parallelism< 1 min< 1 min
      Diameter tolerance± 1 mm± 1 mm
      Thickness tolerance± 1.5 mm± 1.5 mm
      SurfaceSingle sided and double sidedSingle sided and double sided
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