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Materials to be used for optical elements must fulfill some general requirements in order to find considerable application. Compliance with all of these requirements must be checked before a new material can be introduced for optical element production. Moreover, production and quality assurance costs must be low per element. A lens from optical glass may serve as a comparison measure. If an element replacing one or more of such glass lenses costs considerably more than this lens, the new material will be used only if it is capable of providing a special additional advantage.
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