Esco Optics, Inc.

Commercial Quality Windows, Square, N-BK7 Optical Glass*

Commercial Quality Windows, Square, N-BK7 Optical Glass* - Main image
Commercial Quality Windows, Square, N-BK7 Optical Glass* - View 2Commercial Quality Windows, Square, N-BK7 Optical Glass* - View 3
$12.09 $16.34 In stock

Category: Commercial Quality Square

Diameter Tolerance

+/- 0.125 mm

Thickness Tolerance

+/- 0.125 mm

Surface Accuracy

1.0-3.0 mm thickness ≤ 5λ per inch
4.76-12.7 mm thickness ≤ 2λ per inch

Surface Quality

60-40 Scratch-Dig or better

Parallelism

<15'

Edges

Fine ground and safety beveled1

Clear Aperture

85%


1parts 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 a complete inventory of square commercial optical windows of N-BK7 Optical Glass or equivalent glass.* Indicate in order notes if N-BK7 is required.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Scarlett ★★★★★

I needed a square optical window with tight thickness tolerances for a small prototype, and these blanks are dead-on at +/- 0.125 mm. The surface quality is perfectly adequate for my visible-light testing.

Scarlett X. ★★★★★

The surface accuracy on these is impressive for the price — the 2λ per inch tolerance on the thicker windows made a real difference in my laser setup. They fit my mount perfectly with the +/- 0.125 mm diameter tolerance.

Christopher ★★★★★

These square windows are noticeably cleaner than the cheaper ones I've used before, and the 2λ surface accuracy on the thicker pieces really shows in my interferometer setup. Each one came in within the ±0.125 mm thickness tolerance, so mounting them in my holder was hassle-free.

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