Witness samples

Single side polished

Standard specifications

Diameter 25 +0/-0,020 mm

Thickness 2 +/- 0,100 mm

Single sided polished

Flatness λ / 4

CA 80%

S/D 20/10

Laser marking (material type + refractive index)


SSP Witness Samples

Are you looking for high-quality witness samples for your optical thin-film coating production? Our single-side polished witness samples are an excellent choice. They feature a polished surface on one side and a ground surface on the other, making them perfect for reflection measurements on a spectrometer. We engrave the glass type and refraction index on the ground side to ensure production stability during your coating processes.

We understand that cost is a critical factor in your decision-making process. That's why we ensure our witness samples are competitively priced without compromising on quality. We keep a wide variety of witness samples in stock and ready for immediate dispatch.

If you need a different glass type, we're happy to work with you to provide the perfect solution. Simply get in touch with us, and we'll do everything we can to help.

Double side polished

DSP Witness Samples

Our double-side polished witness samples are perfect for your coating applications where a uniform, transparent surface is essential.

Unlike our single-side polished samples, our double-side polished witness samples are designed for transmission measurements on a spectrometer and do not feature engraved glass type or refraction index. We keep a wide variety of double-side polished witness samples in stock and ready for immediate dispatch.

Whether you need a single-side or double-side polished witness sample, you can trust us to deliver a high-quality product at a competitive price.  Get in touch with us to discuss your specific needs. 

If you need a different glass type, we're happy to work with you to provide the perfect solution. Simply get in touch with us, and we'll do everything we can to help.

Standard specifications

Diameter 25 +0/-0.020 mm

Thickness 2 +/- 0.100 mm

Double sided polished

Flatness λ / 4

CA 80%

S/D 20/10