Esco Optics, Inc.

Commercial Quality Windows, Circular, Borofloat 33

Commercial Quality Windows, Circular, Borofloat 33 - Main image
Commercial Quality Windows, Circular, Borofloat 33 - View 2
$4.51 $6.53 In stock

Category: Commercial Quality Circular

Diameter Tolerance

+/- 0.125 mm

Thickness Tolerance

+/- 0.250 mm

Surface Accuracy

5λ per inch

Surface Quality

80-50 Scratch-Dig or better

Parallelism

<15'

Edges

Fine ground and safety beveled*

Clear Aperture

90%

*parts under 25.4mm in diameter may not have beveled edges

Commercial windows are used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows, welding window substrates. Esco carries inventory of circular and square commercial optical windows of Borofloat 33 that is direct equivalent of Pyrex, which is no longer manufactured. Schott Borofloat 33 data sheet is available here.

Don't see a part that matches exactly what you need, perhaps you'd like to modify a dimension or add a coating? Use our fast online quote tool to find out what a modification would cost. 

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Customer Reviews (4.6 / 5 · 5 reviews)

Daniel X. ★★★★★

I needed precise optics for a laser setup, and the 80-50 scratch-dig surface quality on these 5λ/inch windows delivered perfectly—no distortion at all. The +/- 0.125 mm diameter tolerance made fitting into my mount a breeze.

Harper ★★★★★

I was worried the edges would be rough at this price, but they came polished and clean. The tolerances are tight too—my calipers read within the stated +/- 0.125 mm on both discs. Perfect for the optical bench setup I'm building.

Ryan ★★★★★

Ordered two of these for a DIY interferometer setup and the parallelism came in tight enough that I didn't have to fight the fringes at all. Edges arrived cleanly finished with no chips, and both discs matched each other closely in thickness. Genuinely impressed for the price.

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