| 摘要 |
The present invention provides a raw material for manufacturing an inexpensive fluoride crystal with excellent optical characteristics, and a method of manufacturing a fluoride crystal using a carbon fluoride-based gas that can easily be handled and is capable of preventing gases from being taken into a crystal to avoid degradation of transmittance, etc., and provides further a fluoride crystal and a manufacturing method thereof. A method of the present invention of refining a raw material for manufacturing a fluoride crystal comprises the steps of: charging a fluoride raw material into a crucible arranged within a refining furnace, introducing a reactive gas into a refining furnace, heating the fluoride raw material at a temperature lower than the melting point thereof in a reactive gas atmosphere, melting the fluoride raw material in the refining furnace filled with a vacuum atmosphere or an inert gas atmosphere, and then cooling and solidifying the fluoride raw material, and furthermore provides an optical part having transmission characteristics that hardly degrades when it is irradiated repeatedly for a long time with a light having a short wavelength and a high output.
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