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N-BK7 Mirror Blanks

  • Made of N-BK7
  • High scratch-resistance
  • Stable chemical properties
  • Stocked and Custom Products
  • Excellent as windows or mirror substrates

Inquire for custom product  
Code Diameter Thickness Surface Quality Flatness Parallelism Coating Unit Price Delivery Cart
132-001 12.7mm 2.0mm 10/5 S/D λ/10 10 arcsec Uncoated $15.0 2~3 Days
131-001 12.7mm 2.0mm 10/5 S/D λ/4 10 arcsec Uncoated $9.0 2~3 Days
132-005 12.7mm 3.0mm 10/5 S/D λ/10 10 arcsec Uncoated $15.0 2~3 Days
131-005 12.7mm 3.0mm 10/5 S/D λ/4 10 arcsec Uncoated $9.0 2~3 Days
132-009 25.4mm 2.0mm 10/5 S/D λ/10 10 arcsec Uncoated $30.0 2~3 Days
131-009 25.4mm 2.0mm 10/5 S/D λ/4 10 arcsec Uncoated $18.0 2~3 Days
132-013 25.4mm 3.0mm 10/5 S/D λ/10 10 arcsec Uncoated $30.0 2~3 Days
131-013 25.4mm 3.0mm 10/5 S/D λ/4 10 arcsec Uncoated $18.0 2~3 Days
132-017 25.4mm 4.0mm 10/5 S/D λ/10 10 arcsec Uncoated $30.0 2~3 Days
131-017 25.4mm 4.0mm 10/5 S/D λ/4 10 arcsec Uncoated $18.0 2~3 Days
132-021 25.4mm 6.0mm 10/5 S/D λ/10 10 arcsec Uncoated $30.0 2~3 Days
131-021 25.4mm 6.0mm 10/5 S/D λ/4 10 arcsec Uncoated $18.0 2~3 Days
132-025 50.8mm 12.0mm 10/5 S/D λ/10 10 arcsec Uncoated $55.0 2~3 Days
131-025 50.8mm 4.0mm 10/5 S/D λ/4 10 arcsec Uncoated $45.5 2 weeks
131-029 50.8mm 12.0mm 10/5 S/D λ/4 10 arcsec Uncoated $48.5 2~3 Days

Optical windows are used to transmit light and protect work areas or sensitive components from the outside environment. Optical windows use substrates, coatings, or a combination of the two to transmit specific wavelengths or ranges of wavelengths. Uncoated N-BK7 windows could also be used as substrates or blanks of mirrors

N-BK7 features excellent transmission from visible to NIR spectrum, low inclusion of bubbles and impure substance, and ease of manufacturing and machining. Therefore it is an excellent choice for transmission optical components. As mirror substrates, N-BK7 is also advantageous in terms of fine mechanical properties and resistance to scratches, and stable chemical properties. However, it possesses high coefficients of thermal expansion in relative, thus not appropriate for environments where temperatures are changeable.

Shalom EO’s stocked N-BK7 windows or mirror blanks including the Lambda/4 flatness modules and lambda/10 modules, while Lambda/4 flatness is low cost and suitable for most kinds of optical applications, and the Lambda/10 flatness modules are suitable for laser system and other high demanding applications. 

BK7 λ/10 D25.4x2mm Uncoated Windows or Substrates

BK7 λ/10 D25.4x2mm Uncoated Windows or Substrates

BK7 λ/10 D25.4x6mm Uncoated Windows or Substrates

BK7 λ/10 D25.4x6mm Uncoated Windows or Substrates

BK7 λ/4 D25.4x2mm Uncoated Windows or Substrates

BK7 λ/4 D25.4x2mm Uncoated Windows or Substrates