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We offer two grades of stock borosilicate or equivalent  windows. Our standard windows are cut from float sheet material and  our polished grade is then further polished to better flatness and surface quality.

These borosilicate or equivalent windows listed here are made from low expansion borosilicate or equivalent  glass. Borosilicate has excellent transmission over the visible and NIR wavelengths working from 310nm to 2700nm. The surface quality is not as high as the BK7 versions.

Low-expansion windows are very useful in applications where they are exposed to the elements as borosilicate has excellent chemical and thermal-shock resistance and has a maximum working temperature of 500°C. Examples include use in high powered light source applications and they are an excellent choice for cold and hot mirror substrates.   Borosilicate or equivalent windows can also be a good substrate for optical flats as it has low expansion properties and therefore maintains its flatness in different environmental conditions.

Our stock windows are available to buy directly from this site, and we also offer an extensive custom window capability for unique shapes and sizes. For more information on our custom windows please contact our technical sales team.

Material:
Diameter:
Dimensions:
Thickness:

Flatness:
Float type (typical)
Polished grade

Surface quality:
Float type (typical)
Polished grade
Parallelism:

Borosilicate (LEGB) or equivalent
+0/-0.2mm
±0.3mm
±0.2mm (float)
±0.1mm (polished)

1λ over 10mm dia
<50mm-λ/2 over 90% of aperture
≥50mm-1λ over 90% of aperture

<60:40 Scratch/Dig
<40:20 Scratch/Dig
<1 arc minute (polished type)

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.

29 Items

Name Material Coating Coated Sides Diameter (mm) Length (mm) Width (mm) Thickness (mm) Grade Price Buy
WHP5050 Borosilicate Uncoated 50 50 2 Optically polished
$45.80
WHP5000 Borosilicate Uncoated 50 5 Optically polished
$45.80
WHP4000 Borosilicate Uncoated 40 3 Optically polished
$40.94
WHP2511 Borosilicate Uncoated 25 2 Optically polished
$33.29
WHP2500 Borosilicate Uncoated 25 3 Optically polished
$33.99
WHP1600 Borosilicate Uncoated 16 3 Optically polished
$28.43
WHP1500 Borosilicate Uncoated 15 2 Optically polished
$27.73
WHP1000 Borosilicate Uncoated 10 2 Optically polished
$27.73
WGP5053-AV2 Borosilicate AR 400-1000nm One 50 50 2 Float
$29.82
WGP5052-AV2 Borosilicate AR 400-1000nm Both 50 50 2 Float
$31.90
WGP5051-AV2 Borosilicate AR 400-1000nm Both 50 50 1.1 Float
$30.51
WGP5051 Borosilicate Uncoated 50 50 3.3 Float
$22.87
WGP5050-AV2 Borosilicate AR 400-1000nm One 50 50 1.1 Float
$28.43
WGP5011 Borosilicate Uncoated 50 3.3 Float
$24.95
WGP5000 Borosilicate Uncoated 50 1.1 Float
$22.87
WGP4000 Borosilicate Uncoated 40 1.1 Float
$22.17
WGP2540 Borosilicate Uncoated 40 25 1.1 Float
$15.22
WGP2503-AV2 Borosilicate AR 400-1000nm Both 25 2 Float
$24.95
WGP2502-AV2 Borosilicate AR 400-1000nm One 25 2 Float
$23.98
WGP2501-AV2 Borosilicate AR 400-1000nm Both 25 1.1 Float
$20.78
WGP2500-AV2 Borosilicate AR 400-1000nm One 25 1.1 Float
$19.81
WGP2500 Borosilicate Uncoated 25 1.1 Float
$18.70
WGP1600 Borosilicate Uncoated 16 1.1 Float
$17.31
WGP1003-AV2 Borosilicate AR 400-1000nm One 100 100 2 Float
$73.67
WGP1002-AV2 Borosilicate AR 400-1000nm Both 100 100 2 Float
$83.40
WGP1001-AV2 Borosilicate AR 400-1000nm Both 100 100 1.1 Float
$76.45
WGP100100 Borosilicate Uncoated 100 100 3.3 Float
$29.82
WGP1000-AV2 Borosilicate AR 400-1000nm One 100 100 1.1 Float
$66.72
WGP1000 Borosilicate Uncoated 10 1.1 Float
$17.31

29 Items

1

Borosilicate windows

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