Esco Optics, Inc.

Witness Sample, Transmission, 1.600-1.799

Witness Sample, Transmission, 1.600-1.799 - Main image
$23 $36.5 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 25.40 mm +\-0.10
Thickness 1.50 mm +/-0.25
Flatness < 1 wave @ 633nm 
Surface Quality 60-40 scratch-dig
Edges Fine ground and beveled
Materials S-BSM2, S-NBM51, S-BSM4, S-PHM52, F2, N-SF2, S-LAL7, N-SF5, S-LAL18, LAFN7, S-TIH4, S-TIM35, N-SF10, N-SF11, S-TIH3, SF 11, 
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Customer Reviews (4.2 / 5 · 5 reviews)

Grace U. ★★★★★

The parallelism spec on these witness samples is what sold me—my optical setup needed a reliable reference and this one checks out perfectly against my interferometer. Both sides arrived polished clean with no visible digs or scratches.

Sophia S. ★★★★☆

I needed a precise reference for my spectrometer alignment, and these witness samples give me consistent transmission readings across the band. The scratch-dig of 60-40 is cleaner than some pricier optics I've used, though I wish the parallelism spec were a bit tighter for my setup.

George K. ★★★★☆

The flatness really holds up when I check it against my interferometer setup—both sides came in well under the 1 wave spec at 633nm. Scratch dig of 60-40 is exactly as stated, so no complaints there. Just wish they'd included a small storage case for the price.

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