BK7 Optical Windows
Custom Made
Global Optics supplies custom BK7 optical windows manufactured exactly to customer drawings and specifications.
With no minimum order quantity and full UK inspection prior to dispatch, we support everything from one-off prototypes to production supply.
BK7 is one of the most commonly used optical glass materials, offering a cost-effective solution for general optical applications where extreme environmental performance is not required.
Typical response time: within 24–48 hours depending on specification.
All components are inspected in the UK prior to dispatch to ensure they meet specification.
What We Need to Provide a Quotation
Providing the following information allows us to quote accurately and avoid delays:
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Material (e.g. BK7)
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Diameter / size
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Thickness
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Quantity
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Drawing or specification
When to Use BK7 Optical Windows
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General optical systems
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Visible light applications
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Cost-sensitive projects
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Standard laboratory and industrial use
When Not to Use BK7
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High pressure environments (see sapphire)
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Infrared applications (see CaF₂ / silicon / ZnSe)
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Harsh or abrasive conditions
Why Choose BK7 Optical Windows
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Cost-effective optical material
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Good transmission in visible wavelengths
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Widely available and versatile
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Suitable for general optical applications
Applications
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General optical systems
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Laboratory equipment
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Industrial optics
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Imaging systems
Custom Made to Drawing
All BK7 optical windows are manufactured to customer specifications, including size, thickness, surface quality and tolerances.
We supply components strictly to drawing and support both prototype and production quantities.
Material Comparison
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Compared to sapphire, BK7 is more cost-effective but offers lower mechanical strength.
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Compared to CaF₂, BK7 is suitable for visible wavelengths but not infrared applications.
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Compared to fused silica, BK7 is more economical but less suitable for high precision or UV systems.
Coatings Available
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Anti-reflective coatings
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Custom coating options
We also supply optical windows in materials such as fused silica, Caf2 and Sapphire depending on application requirements.