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Knight Optical(UK) Ltd - [email protected] - +44 (0)1622 859444

Precision grade windows

What are you looking for in Stock?

These precision grade BK7 or equivalent windows are used to seal optical enclosures especially suited to low power laser applications.  Our stock range of ¼ wave BK7 or equivalent windows are uncoated and also AR coated both faces with extended BBAR for visible and NIR applications (450-900nm) We are also soon to introduce a range that offers increased performance in the telecom region of 1100-1700nm. Our stock BK7 or equivalent  windows can also be AR coated for other wavelengths, beamsplitter coated or mirror coated to meet your bespoke custom requirements.

These BK7 or equivalent  windows have very parallel faces so will introduce minimal beam deviation.  Flatness and surface quality is also tightly controlled.  Stock BK7 or equivalent  plates can be edged down to smaller diameters and custom sizes at short notice, please speak to our sales team.

Material: N-BK7 or equivalent
Diameter: +0.0 / -0.2 mm
Length / width: ± 0.1mm
Thickness: ±0.1mm
Flatness: <λ/4 over 85% of aperture
Surface quality: <40:20 scratch/dig
Parallelism: 1 arc minute

Coating:

Windows with suffix "AV2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.6%@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.

Coatings:
Windows with suffix "AV2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.6%@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

Coating - Hydrophobic & Oleophobic

Stock Optics

Get a Custom Quote

Part No. MaterialCoatingCoated SidesDiameter
(mm)
Length
(mm)
Width
(mm)
Thickness
(mm)
Coated sidesThick
(mm)
Price
(Ex.VAT)
Buy
WQK1515-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides15154 £33.70
WQK7575-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides75758 £124.50
WQK7500-AV2 BK7 or equivalentAR coated ([email protected])Both sides758 £111.70
WQK5001-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides506 £57.00
WQK7502-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides758 £111.70
WQK6501-AI1 BK7 or equivalentAR coated (630-1100nm)65Both sides8 £90.00
WQK1002-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides103 £28.90
WQK6502-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides658 £90.00
WQK1000 BK7 or equivalentUncoated103 £19.25
WQK1000-AV2 BK7 or equivalentAR coated ([email protected])Both sides103 £28.90
WQK1010 BK7 or equivalentUncoated10103 £19.25
WQK1500 BK7 or equivalentUncoated153 £19.25
WQK1500-AV2 BK7 or equivalentAR coated ([email protected])Both sides153 £30.80
WQK2500 BK7 or equivalentUncoated256 £23.25
WQK2500-AV2 BK7 or equivalentAR coated ([email protected])Both sides254 £33.70
WQK2501 BK7 or equivalentUncoated25.46.35 £21.95
WQK2515 BK7 or equivalentUncoated25156 £24.95
WQK2525 BK7 or equivalentUncoated25256 £25.45
WQK4000 BK7 or equivalentUncoated406 £32.25
WQK4000-AV2 BK7 or equivalentAR coated ([email protected])Both sides406 £48.40
WQK4025 BK7 or equivalentUncoated40256 £33.45
WQK4040 BK7 or equivalentUncoated40406 £34.95
WQK5000 BK7 or equivalentUncoated506 £37.95
WQK5000-AV2 BK7 or equivalentAR coated ([email protected])Both sides506 £57.00
WQK5050 BK7 or equivalentUncoated50508 £39.25
WQK5050-AV2 BK7 or equivalentAR coated ([email protected])Both sides50508 £58.90
WQK6500 BK7 or equivalentUncoated658 £59.95
WQK4040-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides40406 £52.50
WQK2525-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides25256 £38.20
WQK4040-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides40406 £52.50
WQK7501-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides758 £111.70
WQK4001-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides406 £48.40
WQK7575-AV2 BK7 or equivalentAR coated ([email protected])Both sides75758 £124.50
WQK1501-AI1 BK7 or equivalentAR coated (630-1100nm)15Both sides3 £30.80
WQK5002-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides506 £57.00
WQK1000-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides103 £28.90
WQK5050-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides50508 £58.90
WQK2525-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides25256 £38.20
WQK1515 BK7 or equivalentUncoated15154 £22.45
WQK1502-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides153 £30.80
WQK2502-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides254 £33.70
WQK1515-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides15154 £33.70
WQK7575-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides75758 £124.50
WQK4002-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides406 £48.40
WQK2501-AI1 BK7 or equivalentAR coated (630-1100nm)Both sides254 £33.70
WQK7575 BK7 or equivalentUncoated75758 £82.95
WQK1515-AV2 BK7 or equivalentAR coated ([email protected])Both sides15154 £33.70
WQK6500-AV2 BK7 or equivalentAR coated ([email protected])Both sides658 £90.00
WQK2525-AV2 BK7 or equivalentAR coated ([email protected])Both sides25256 £38.20
WQK6540 BK7 or equivalentUncoated65408 £62.95
WQK5050-AI2 BK7 or equivalentAR coated (1050-1700nm)Both sides50508 £58.90
WQK4040-AV2 BK7 or equivalentAR coated ([email protected])Both sides40406 £52.50
WQK2600 BK7 or equivalentSingle layer MgF2 AR R.avg<0.2%@550nm22.951.5 £24.45
WQK2511 BK7 or equivalentUncoated254 £22.45
WQK7500 BK7 or equivalentUncoated758 £74.45

Get a Custom Quote

Get in touch

Our Multi-Lingual Sales Team are here to help with your requirments:

UK +44 (0)1622 859444
UK +44 (0)1622 850614
UK +44 (0)1622 851078
+1 401 583 7846

International Shipping

We are able to ship to most countries at good rates, please click here for more info.

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