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Knight Optical(UK) Ltd - sales@knightoptical.co.uk - +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 / -0.15 mm
Length / width: ± 0.1mm
Thickness: ±0.1mm
Flatness: >λ/4 over 90% 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 <0.5%@450-900nm

  • 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 <0.5%@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 <0.6%@1050-1700nm

Stock Optics

Get a Custom Quote

Part No. CoatingCoated sidesDiameter
(mm)
Length
(mm)
Width
(mm)
Thick
(mm)
Material Price
(Ex.VAT)
Buy
WQK1515-AI2 AR coated (1050-1700nm)Both sides15154BK7 or equivalent £28.70
WQK7575-AI2 AR coated (1050-1700nm)Both sides75758BK7 or equivalent £108.60
WQK7500-AV2 AR coated (Ext.Vis@450-900nm)Both sides758BK7 or equivalent £87.30
WQK5001-AI1 AR coated (630-1100nm)Both sides506BK7 or equivalent £51.95
WQK1510 Uncoated15103BK7 or equivalent £12.15
WQK7502-AI2 AR coated (1050-1700nm)Both sides758BK7 or equivalent £87.30
WQK6501-AI1 AR coated (630-1100nm)Both sides658BK7 or equivalent £63.30
WQK1002-AI2 AR coated (1050-1700nm)Both sides103BK7 or equivalent £21.50
WQK6502-AI2 AR coated (1050-1700nm)Both sides658BK7 or equivalent £64.45
WQK1000 Uncoated10--3BK7 or equivalent £12.15
WQK1000-AV2 AR coated (Ext.Vis@450-900nm)Both sides103BK7 or equivalent £19.75
WQK1010 Uncoated10103BK7 or equivalent £12.15
WQK1500 Uncoated153BK7 or equivalent £12.15
WQK1500-AV2 AR coated (Ext.Vis@450-900nm)Both sides153BK7 or equivalent £20.60
WQK2500 Uncoated256BK7 or equivalent £14.25
WQK2500-AV2 AR coated (Ext.Vis@450-900nm)Both sides254BK7 or equivalent £22.95
WQK2501 Uncoated25.46.35BK7 or equivalent £13.95
WQK2515 Uncoated25156BK7 or equivalent £11.95
WQK2525 Uncoated25256BK7 or equivalent £16.55
WQK4000 Uncoated406BK7 or equivalent £19.95
WQK4000-AV2 AR coated (Ext.Vis@450-900nm)Both sides406BK7 or equivalent £31.00
WQK4025 Uncoated40256BK7 or equivalent £23.50
WQK4040 Uncoated40406BK7 or equivalent £21.95
WQK5000 Uncoated506BK7 or equivalent £24.00
WQK5000-AV2 AR coated (Ext.Vis@450-900nm)Both sides506BK7 or equivalent £37.60
WQK5050 Uncoated50508BK7 or equivalent £27.80
WQK5050-AV2 AR coated (Ext.Vis@450-900nm)Both sides50508BK7 or equivalent £48.70
WQK6500 Uncoated658BK7 or equivalent £35.65
WQK4040-AI2 AR coated (1050-1700nm)Both sides40406BK7 or equivalent £22.50
WQK2525-AI2 AR coated (1050-1700nm)Both sides25256BK7 or equivalent £42.70
WQK252-AI1 AR coated (630-1100nm)Both sides25256BK7 or equivalent £48.70
WQK4040-AI1 AR coated (630-1100nm)Both sides40406BK7 or equivalent £32.50
WQK7501-AI1 AR coated (630-1100nm)Both sides758BK7 or equivalent £87.30
WQK4001-AI1 AR coated (630-1100nm)Both sides406BK7 or equivalent £37.50
WQK7575-AV2 AR coated (Ext.Vis@450-900nm)Both sides75758BK7 or equivalent £95.40
WQK1501-AI1 AR coated (630-1100nm)Both sides153BK7 or equivalent £24.45
WQK5002-AI2 AR coated (1050-1700nm)Both sides506BK7 or equivalent £42.85
WQK1000-AI1 AR coated (630-1100nm)Both sides103BK7 or equivalent £21.15
WQK5050-AI1 AR coated (630-1100nm)Both sides50508BK7 or equivalent £44.90
WQK2525-AI1 AR coated (630-1100nm)Both sides25256BK7 or equivalent £38.80
WQK1515 Uncoated15154BK7 or equivalent £14.25
WQK1502-AI2 AR coated (1050-1700nm)Both sides153BK7 or equivalent £11.30
WQK2502-AI2 AR coated (1050-1700nm)Both sides254BK7 or equivalent £25.25
WQK1515-AI1 AR coated (630-1100nm)Both sides15154BK7 or equivalent £26.10
WQK7575-AI1 AR coated (630-1100nm)Both sides75758BK7 or equivalent £49.10
WQK4002-AI2 AR coated (1050-1700nm)Both sides406BK7 or equivalent £35.00
WQK2501-AI1 AR coated (630-1100nm)Both sides254BK7 or equivalent £22.95
WQK7575 Uncoated75758BK7 or equivalent £27.50
WQK1515-AV2 AR coated (Ext.Vis@450-900nm)Both sides15154BK7 or equivalent £24.80
WQK6500-AV2 AR coated (Ext.Vis@450-900nm)Both sides658BK7 or equivalent £63.30
WQK2525-AV2 AR coated(Ext/Vis450-900nm)Both sides25256BK7 or equivalent £32.50
WQK6540 Uncoated65408BK7 or equivalent £44.95
WQK5050-AI2 AR coated (1050-1700nm)Both sides50508BK7 or equivalent £26.80
WQK4040-AV2 AR coated (Ext.Vis@450-900nm)Both sides40406BK7 or equivalent £39.50
WQK2600 Single layer MgF2 AR R.avg<0.2%@550nm22.951.5BK7 £8.50

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
US +001 401-583-7846

International Shipping

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

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