Method of making a <250 nm wavelength optical fluoride crystal and device

The optical fluoride crystal treatment device of the invention includes a enclosure (12) separating the device from its external environment, heating means to heat and keep the internal volume (16) of said enclosure (12) at a predetermined temperature, at least one hollow platform (20) delimiting an...

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Bibliographische Detailangaben
Hauptverfasser:	MAYOLET ALEXANDRE M, KERDONCUFF ALAIN
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY CRYSTAL GROWTH GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	The optical fluoride crystal treatment device of the invention includes a enclosure (12) separating the device from its external environment, heating means to heat and keep the internal volume (16) of said enclosure (12) at a predetermined temperature, at least one hollow platform (20) delimiting an internal chamber (22) whose upper wall (24) bears at least two independent diffusers (30) each delimiting a cavity (32) able to receive a unitary quantity (100) of said optical fluoride crystal substance, each of said cavities (32) communicating with said internal chamber (22) of the corresponding platform (20), a gas supply source containing said reactive gas, and means (50, 52, 54) for distributing said gas containing said reactive gas from said supply source to the inside of the internal chamber of each platform and having means (44) for regulating the pressure of said distributed gas. This optical fluoride crystal treatment device is preferably used to carry out anionic purification with a reactive gas formed of a fluoridation gas, a fluoride powder of an alkaline metal or alkaline-earth metal in the making of optical fluoride crystals.