| http://www.w3.org/ns/prov#value | - Therefore, the present inventors have prepared two types of samples of the optical device 10 in each of which the film 41 having a thickness of ??/6 is formed on the end surfaces 91 a by evaporation, where the film 41 is formed of MgF2 in the first type of samples, and YF3 in the second type of samples.
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