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Cemented & Optically Contacted Zero-Order
 

   

 A quarter- or half-wave retarder made from two plates of quartz 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.

Cemented & Optically Contacted Zer0-Order Waveplates
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