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Witness Samples

Name: Witness Samples
Brand: ECOPTIK INDUSTRIAL PTE.LTD.

Coating test witness samples refers to the auxiliary substrate placed in the coating machine together with the official product (such as optical filter, lens) during the coating process. Its core function is to monitor the coating process parameters (such as film thickness and refractive index) in real-time, indirectly reflecting and ensuring that the performance of the target coating component meets the design requirements.

Although coating test witness samples do not directly participate in the final optical system work, they are the "behind the scenes heroes" who ensure the quality, consistency, and reliability of coating products. It provides coating engineers with an eye to observe the coating process and is an essential key link in achieving high-performance film preparation.

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Features of Witness Samples

The witness samples provided by ECOPTIK include a full range of brands such as CDGM, Schott, CORNING, etc. The general diameter is about 1'' and the thickness is 1-3mm, which basically adapts to the size of standard spectrophotometer tools.
ECOPTIK witness samples be polished one side or both surface according to the customers' requirement to be used meet for transmit or reflect thin film coating

Specification of Witness Samples

Diameter	20mm-25.4mm
Thickness	1mm-3mm
Clear aperture	> 85% of diameter
Surface quality	60/40 or better
Parallelism	<3 arc min or better
Flatness	λ/4 - λ/10@633nm
Edges	Fine ground
Beveled	<0.2mm x 45deg

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