Esco Optics, Inc.

Witness Sample, Transmission, 1.800-2.000

Witness Sample, Transmission, 1.800-2.000 - Main image
$18.57 $29.95 In stock

Category: Transmission Witness Samples

Esco Optics witness samples used for transmission are precision polished on both sides to a scratch dig of 60-40. Flatness of each side is < 1 wave @ 633nm at 80% CA. Parallelism < 1 arc min. Edges are safety beveled. Witness sample diameter is 25.40mm and the thickness is 1.50mm. 

All of our witness samples are melt lot controlled and individual melt data is available on request. The refractive index values listed are representative of nd at 587nm. 

Diameter 25.40mm +\-0.10
Thickness 1.50 mm +/-0.25
Flatness < 1.0 wave @ 633nm 
Surface Quality 60-40 scratch-dig
Edges Fine ground and beveled
Materials S-TIH6,  S-LAH53, PBH56, SF-57, S-LAH58
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Customer Reviews (4.6 / 5 · 5 reviews)

Amelia ★★★★★

The polished surfaces are impressively clean under a loupe, and the specified 60-40 scratch-dig held up exactly as promised. I checked the flatness at a couple of wavelengths and it's right at that 1-wave tolerance, which made my transmission measurements feel rock solid.

Sophia ★★★★★

Ordered these to verify coating runs before committing a full batch, and the parallelism spec held up under our interferometer — no wedge issues at all. Both faces were clean right out of the box, no re-polishing needed.

Victoria ★★★★★

The 60-40 scratch-dig finish on both sides is noticeably cleaner than the cheaper samples I've ordered elsewhere, and the polished surfaces made alignment under the laser straightforward. Parallelism held up well across the whole aperture too.

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