Zerodur® Mirror Blanks

  • Low Coefficient of Thermal Expansion Compared to Fused Silica
  • Front Surface Flatness: λ/10
  • Ø1/2", Ø1", and Ø2" Optics


Ø1/2" Mirror Blank


Ø1" Mirror Blank


Ø2" Mirror Blank

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  • Extremely Low Coefficient of Thermal Expansion
  • Three Sizes Available: Ø1/2", Ø1", and Ø2"
  • Front Surface Flatness of λ/10
  • Fine Ground Back Surface

Thorlabs' Zerodur®* mirror blanks are designed to be used as front-surface mirrors when coated. Fabricated from substrate-grade Zerodur, which has an extremely low coefficient of thermal expansion, these mirror blanks offer a high degree of purity and exceptional environmental durability. Zerodur's coefficient of thermal expansion is 0 ± 0.100 x 10-6 /°C, which is significantly smaller than the value for fused silica, 0.55 x 10-6 /°C. This property makes these mirror blanks ideal for high-power systems like CO2 lasers, amplified Ti:sapphire lasers, and industrial machining lasers, as well as other applications that are sensitive to thermally-induced beam drift. Each of these blanks is engraved with part number on the back side.

These Zerodur blanks can be coated with our reflective coatings such as broadband dielectric, metallic, or custom coatings. These coatings can provide high reflectivity for ultraviolet through near-infrared wavelengths. Please contact Technical Support for information on coatings and price. For applications that are less sensitive to thermally induced beam drift, Thorlabs also offers a line of fused silica mirror blanks.

*Zerodur® is a registered trademark of Schott.

Item # Diameter Thickness Parallelism Surface Quality Surface Flatness Clear Aperture Materiala Back Surface Quality
PF0511 12.7 mm +0.0/-0.1 mm 6.0 mm ± 0.2 mm ≤3 arcmin 10-5 Scratch-Dig λ/10 @ 632.8 nm >90% of Diameter Zerodur® Fine Ground
PF1011 25.4 mm +0.0/-0.1 mm 6.0 mm ± 0.2 mm
PF2011 50.8 mm +0.0/-0.1 mm 12.0 mm ± 0.2 mm
  • Click Link for Detailed Specifications on the Substrate

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Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PF0511 Support Documentation
PF0511Ø1/2" (12.7 mm) Zerodur® Mirror Blank
PF1011 Support Documentation
PF1011Ø1" (25.4 mm) Zerodur® Mirror Blank
PF2011 Support Documentation
PF2011Ø2" (50.8 mm) Zerodur® Mirror Blank
7-10 Days