Knight Optical (USA)

(001)401-583-7846 https://www.knightoptical.com

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N-BK7 Windows for use in Camera Systems

Knight Optical offer a range of Stock N-BK7 Precision Grade Windows, for use within Camera Systems.

Our precision grade N-BK7 windows are often used to seal optical enclosures and act as a protective window for the optical and electrical component behind the window, particularly within CCTV and ANPR systems where there is a risk of damage. N-BK7 provides excellent transmission in the visible and near infrared spectrum which can be enhanced still with our Anti Reflective coatings.

Our stock range of ¼ wave N-BK7 or equivalent windows are supplied either uncoated or with the option of an Anti- Reflective coating on both faces with extended BBAR for visible and NIR applications within the 450-900nm
wavelength range. We can also offer custom solutions for your application, whether it is a custom size or a coating to optimise a different wavelength range, beamsplitter coated or mirror coated to meet your bespoke requirements.

Our N-BK7 windows offer 1 arcminute parallelism for minimal beam deviation and with flatness of >λ/4 over 90% of the clear aperture and a surface quality of <40/20 scratch dig to allow for high precision optical windows for your camera application.

We hold a large inventory of N-BK7 Windows.

  • Stock sizes from 10mm to 75mm diameter as well as square and rectangular shapes.
  • Custom sizes available to quotation.
  • Different coating options to suit your needs
    Typical specs:

    Material: N-BK7 or Equivalent
    Diameter Tolerance: 0.0/-0.15mm
    Length/Width Tolerance: ±0.1mm
    Thickness Tolerance: ±0.1mm
    Flatness: >λ/4 over 90% aperture
    Surface Quality: <40/20 Scratch/Dig
    Parallelism: 1 arc minute
    Coating: Windows with the suffix “AV2” are coated on both faces with our extended
    broadband multilayer antireflective coating <0.5%@450-900nm


All our N-BK7 Windows are fully inspected on their quality in our ISO 9001:2015 certified, state-of-the-art Metrology laboratory, with our Trioptics, Optispheric, Varian and Starrett AV300. This allows us to work to
the highest QA standards and meet the tolerance specifications on these precision components.

Contact our technical sales team to discover how Knight Optical’s high quality N-BK7 Windows and superior service can improve your instrumentation and supply chain experience.

n bk7 windows


UK, Europe, Asia & RoW: E-Mail info@knightoptical.co.uk Tel 44 (0)1622 859444
USA & Canada: E-Mail usasales@knightoptical.com Tel 001 401-583-7846

  • View our QA and metrology information
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