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BK7 or equivalent Window 25mmdia x 4mthk AR coated ([email protected])


$57.27
IN STOCK
SKU: WQK2500-AV2
More Information
Diameter (mm) 25
Material BK7 or equivalent
Coating AR coated ([email protected])
Thickness (mm) 4
Coated Sides Both sides

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:
Diameter:
Length/Width:
Thickness:
Flatness:
Surface Quality:
Parallelism:
Coating:
N-BK7 or equivalent
+0/-0.2 mm
± 0.1mm
± 0.1mm
<λ/4 over 85% of aperture
<40:20 scratch/dig
1 arc minute

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