Manufacturing Polarization Filters
Country: United States
Date: April 2007
How are polarized filters made?
Although I am familiar with the general principles of
polarized filters (specifically the sheet polarizers known by
the registered trade name of "Polaroid), I was not aware of
the basic manufacturing methods of the various types of these
materials. For a lot more detail that I can tell you, have a
look here... http://en.wikipedia.org/wiki/Polaroid
The general principle is that a layer of long narrow crystals
are laid down on a thin sheet of clear plastic, then the
plastic sheet is stretched or otherwise stressed in one
direction to align the crystals all in a single direction.
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Update: June 2012