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Subject: shape of witness sample

Date: 12/19/01 at 3:13 PM
Posted by: charlie
E-mail: bk748@hotmail.com
Message Posted:

Dear All:

When doing coating, we use a flat glass as witness sample, to check the coating spectrum.

What do you use?

Recently, i am asked to check the coating performance (i.e: Anti-reflection etc) for non-flat pieces, such as the shape of real lenses--biconcave, biconvex etc.
So my questions are: (1) what do you use as witness sample--flat? curved?
(2) if it is curved, the follow-up question is: are the spectra the same as flat? If not the same, what do you do to know the real coating performance?

Thanks for any response.


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