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

Posted by Dwight Lindsey on Apr 15th 2017

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

Our Zygo InterferometerI'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.  …

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