Witness Samples, Reflection, 1.400-1.500Esco PN:
Esco Optics witness samples used for reflection are precision polished on one side to a scratch dig of 60-40. The flatness of the polished side is < 1 wave @ 633nm over a 90% CA. Witness sample diameter is 25.40mm and the thickness is 2.0mm +\-0.20. The second side is fine ground. Edges are safety beveled.
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 the nd at 587nm.