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Reference.org
Polarization controller
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<p>A polarization controller is an <a href="/facts/Optical_device/p0vq4S1T">optical device</a> which allows one to modify the <a href="/facts/Polarization_(waves)/fP33m0eD">polarization state</a> of <a href="/facts/Light/jeofpMn4">light</a>. </p>