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Silicon and Germanium

We supply high quality silicon and germanium crystals, produced by the Czochralski process.

The properties such as electrical resistance, IR transmission, crystal orientation and residual stress of the crystals can be adjusted according to customer requirements.

Our delivery program includes


  • Customised sizes
  • Ø up to 457.2 mm
  • Thickness up to 381 mm

CNC machined parts

  • Complex geometries
  • Sizes up to 444.5 mm
  • Tolerances smaller than 0.015 mm
  • Surface roughness up to 16 µm

Curved surfaces

  • Sizes up to Ø 368.3 mm
  • Sag tolerance: ±1 µm
  • Aspheres: Near net curve fit available

Polished substrates

  • Flat larger Ø 355.6 mm, spherical larger Ø 203.2 mm possible
  • S/D: better than 20/10
  • Surface roughness: flat less than 15 Å, spherical on request
  • Flatness: flat better than λ/10, spherical better than λ/4


  • Infrared windows and lenses
  • Laser mirrors
  • Wafers for semiconductors
  • Coating materials

Transmission curve Silicon

Transmission curve Germanium

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