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Mirror Blanks

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Mirror Blanks

Optical Coatings and Substrates
Optic Cleaning Tutorial

Common Specifications of Mirror Blanks

  • Front Surface Flatness: λ/10
  • Front Surface Quality: 40-20 Scratch-Dig
  • Wedge: <5 arcmin
  • Clear Aperture: >90% of Diameter
  • Back Surface: Fine Ground
  • Volume Discounts Available

Thorlabs' mirror blanks are designed to be used as front-surface mirrors when coated. Fabricated from fused silica, a material known to exhibit high transmission in the 185 nm to 2.1 μm range (refer to the transmission graph to the right), these mirror blanks offer a high degree of purity and exceptional environmental durability. The table to the right provides additional details about these stock mirror blanks, which are available with a λ/20 surface flatness upon request. Please e-mail our Technical Support team for a quotation. The transmission plot to the right corresponds to the 6 mm thick optical elements.

Item #DiameterThicknessMaterial
PF05-03Ø12.7 mm +0.0/-0.1 mm6 mm ± 0.2 mmFused Silica
PF10-03Ø25.4 mm +0.0/-0.1 mm6 mm ± 0.2 mmFused Silica
PF20-03Ø50.8 mm +0.0/-0.1 mm12.7 mm ± 0.2 mmFused Silica
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Posted Comments:
Poster: ccrocker
Posted Date: 2014-06-12 14:11:01.143
Is it possible to order get these backside polished?
Poster: jlow
Posted Date: 2014-06-12 02:28:00.0
Response from Jeremy at Thorlabs: Yes we can quote these with the backside polished. I will contact you directly to get more information on the polish quality needed and provide a quote.
Poster: tor
Posted Date: 2010-11-23 16:12:36.0
Response from Tor at Thorlabs to Andres: While beamsplitters are designed to pass and reflect a specific fraction of light, a reflective ND filter may be more suitable for detector applications. I have contacted you for more information regarding your transmission requirements.
Poster: andres.aragoneses
Posted Date: 2010-11-23 15:32:40.0
Dear sir/madam I would like to know if you provide half transparent mirrors, or if that is just beam-splitters. I would like to put a mirror in front of a 650nm laser and measure its intensity putting the detector on the other side of the mirror, so the mirror shloud let a fraction of light pass through it. sincerely Andrés Aragoneses (
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Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
PF05-03 Support Documentation
PF05-03 Ø1/2" Fused Silica Mirror Blank, Thickness: 6.0 mm ± 0.2 mm
PF10-03 Support Documentation
PF10-03 Ø1" Fused Silica Mirror Blank, Thickness: 6.0 mm ± 0.2 mm
PF20-03 Support Documentation
PF20-03 Ø2" Fused Silica Mirror Blank, Thickness: 12.7 mm ± 0.2 mm
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