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Zerodur glass ceramic with extremely low coefficient of thermal expansion

Very low absorption values

Maximum reflection

Own development department

Zerodur optics

Zerodur is used as a substrate material for precision optics in optical measurement systems due to its exceptional thermal properties. This material is ideal for applications with disturbing temperature fluctuations due to its extremely low thermal expansion coefficient. It is therefore used as in optical elements in astronomical telescopes, precision metrology and space missions.

  • Density: 2.53 [g/cm3]
  • Coefficient of thermal expansion: 0 +/- 0.02 – 0.1 [10-6/K]
  • Thermal conductivity: 1.46 [W/mK]

Die Zeroduroptiken der Pleiger Laseroptik:


Durchmesser: +0,0/ -0,1 mm

Dicke: +/- 0,1 mm

Planität: < Lambda / 10 (alle D 25 mm)

Optiken aus Zerodur fertigen wir nur nach Kundenwunsch.


Optics for precision applications:

  • Lightweight mirrors (astronomy)
  • Lightweight mirrors (space)
  • Measurement technology


With a optical coating, Zerodur optics are optimized for your application.

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Gold or silver mirror?

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