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Deposition Sciences Inc. - Difficult Coatings - LB - 8/23
Photonics Dictionary

magnesium fluoride

A colorless, crystalline compound whose low refractive index (n = 1.38) makes it effective as a lens antireflection coating when deposited by thermal evaporation in a near vacuum. This process develops a coating that is robust and stable, though only a few molecules thick.
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