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Witness Samples
Lens Coating

Witness Samples

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


Features of Witness Samples

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


ECOPTIK at APE 2026
Exhibition time: February 4-6, 2026Exhibition address: Sands Expo & Convention Centre, SingaporeBooth No. B234

18

2026.03

ECOPTIK at SPIE Photonics West 2026
Exhibition time: January 20-22, 2026Exhibition address: Moscone Center, San FranciscoBooth No.:#1767

18

2026.03

Pushing the Boundaries of Vision: Custom Plan Apochromatic Objectives by ECOPTIK
Top-tier scientific research and demanding industrial applications can't afford compromise. When standard optics fall short, you need a partner capable of engineering vision at the microscopic lev...

30

2025.10

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