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Zerodur®

Optimum Transmission Range:

Ideal Applications:

 None

 High accuracy interferometer mirror substrates

 Large astronomical telescope mirrors

 Ring-laser gyroscope elements

 Laser resonator distance gauges


Zerodur® is a highly homogeneous, glass ceramic whose thermal and mechanical properties are extremely stable over a wide temperature range. This porous-free material is a carefully chosen, temperature treated combination of a glass with a positive expansion coefficient and a quartz structure crystalline phase with a negative expansion coefficient. The resultant mixture provides a material with a near zero coefficient of thermal expansion. Zerodur® provides outstanding homogeneity, but due to absorption near the blue end of the visible spectrum, is rarely used in refractive applications.