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Linear Polarizer vs Circular Polarizer:  What's the difference?

Linear Polarizer vs Circular Polarizer: What's the difference?

by Dwight Lindsey
A question we often get is:  "Should I purchase a linear polarizer or a circular polarizer?, what's the difference?" The short answer is that both Linear and Circular Polarizers do the same thing. The actual polarization effects such…
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…