Method for the production of alkali or alkaline earth fluoride-crystals and the produced crystals

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A process for producing fluoride crystals, in particular calcium fluoride crystals, having high radiation resistance to ultraviolet radiation, which includes : provisioning of a crystal powder (6) containing alkali metal fluoride or alkaline earth metal fluoride to form a raw crystal mass, melting of the raw crystal mass in a crystal growing unit (11) and solidifiying of the molten raw crystal mass by cooling. In the process, an ammonium salt (7) of a complex fluoro acid and an aliphatic alcohol (8) are added to the crystal powder (6) or to the raw crystal mass, to decrease oxidic impurities. A fluoride crystal produced by the process and also an optical component formed from such a fluoride crystal are also disclosed.