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Sheetak -  Cooling at your Fingertip 11/24 LB
Photonics Dictionary

zero-order retarder

A quarter- or half-wave retarder made from two plates of quartz, mica or polymer with their fast axes crossed; the difference in thickness between the two plates determines the retardance. Zero-order retarders provide accurate retardance over a broad range of wavelengths and are more durable than single-element retarders.
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