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Is there an AR coating on the Bereks variable wave plate?

April 26, 2017ar Coating plate wave

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Is there an AR coating on the Bereks variable wave plate?

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No, the Model 5540 variable wave plate uses a single piece of magnesium fluoride without any AR coating. We do not provide an AR-coating for the magnesium fluoride because this material has a refractive index that is fairly low (about 1.40). This corresponds to a reflectivity of about 2.8% per surface, and so, the transmission of the Model 5540 is calculated to be approximately 94.4%.