Witness Sample
Coating on different optical surfaces, including spherical, aspherical, planar, etc., but how to better detect the performance of thin film? The usual landscape photometer detection systems are suitable for plane detection, from which the witness samples are derived. Through the witness sample, the transmittance, reflectivity, actual applicable temperature, moderate and so on of the film can be detected.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Diameter | 20mm-25.4mm |
| Thickness | 1mm-3mm |
| Clear Aperture [of diameter] | > 85% of diameter |
| Surface Quality [or better] | 60/40 or better |
| Parallelism [or better] | <3 arc min or better |
| Surface Flatness [@633nm] | λ/4 - λ/10@633nm |
| Edges | Fine ground |
| Bevel [45deg] | <0.2mm x 45deg |
Key Features
Datasheet
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Supplier Information
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