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How Flat is Flat . . . and why should we care?

How Flat is Flat . . . and why should we care?

by Dwight Lindsey
I'm sitting today with our new-to-us Zygo Phase Shift Interferometer, which we bought recently to check and control the flatness of the filters we manufacture and sell.  It's a very cool machine.  Just impressive in every way. As…