Knight Optical’s N-BK7 (equivalent) windows are an excellent choice for sealing optical enclosures and are well-suited for low-power laser applications. Our stock range includes uncoated and AR-coated options with extended BBAR coatings for visible and NIR applications (450-900nm), as well as the telecom region of 1050-1700nm. Featuring highly parallel faces for minimal beam deviation and tightly controlled flatness and surface quality, these windows ensure reliable optical performance.
N-BK7 windows can also be custom-coated for specific wavelengths, including beamsplitter and mirror coatings, to meet bespoke requirements.
Stock options can be quickly edged to custom diameters and sizes—contact our sales team for more details.
Windows with suffix "AV2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.5%@450-900nm
Windows with suffix "AI1" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.4%@630-1100nm
Windows with suffix "AI2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.4%@1050-1700nm
Edge down of stock windows to smaller diameters.
Stock windows can be machined to custom square/ rectangular apertures.
Mounting options.
Custom AR coatings.
Custom mirror and beamsplitter coatings can be applied to uncoated precision grade BK7 windows.
Please enquire about flatter options.
Windows with suffix "AV2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.5%@450-900nm
Windows with suffix "AI1" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.4%@630-1100nm
Windows with suffix "AI2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.4%@1050-1700nm
| Name | Material | Coating | Coated Sides | Diameter (mm) | Length (mm) | Width (mm) | Thickness (mm) | Price | Buy |
| WQK7575-AV2 | BK7 or equivalent | AR coated (Ext.Vis@450-900nm) | Both sides | 75 | 75 | 8 |
£159.50
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| WQK1000-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 10 | 3 |
£42.50
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| WQK1501-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 15 | 3 |
£46.30
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| WQK2501-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 25 | 4 |
£51.90
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| WQK4001-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 40 | 6 |
£68.90
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| WQK5001-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 50 | 6 |
£80.20
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| WQK6501-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 65 | 8 |
£123.60
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| WQK7501-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 75 | 8 |
£150.00
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| WQK1515-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 15 | 15 | 4 |
£50.00
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| WQK2525-AI1 | BK7 or equivalent | AR coated (630-1100nm) | Both sides | 25 | 25 | 6 |
£59.40
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