Optical member, method of manufacturing the same, and...

Details Optical member, method of manufacturing the same, and... Optical member, method of manufacturing the same, and...

2007-01-23

2007-01-23

Hiteshew, Felisa (Department: 1722)

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth from liquid or supercritical state

Havin growth from molten state

C117S082000, C117S083000

Reexamination Certificate

active

10973260

ABSTRACT:
A method of manufacturing an optical member includes a crystal growing step and a carving step. The crystal growing step includes melting a mixture of fluoride powder and a scavenger at a melting temperature of a melting point for the fluoride and above, and then crystallizing the melted fluid and further cooling down an obtained fluoride crystal in a temperature range from 1000° C. to 900° C. by a temperature decreasing rate in a range from 0.1 to 5° C./hr. The carving step includes carving an optical member out of the fluoride crystal obtained in the crystal growing step such that the optical member is made of a fluoride crystal in which a maximum diameter dmaxof scattering bodies existing internally and a quantity nsof the scattering bodies per 1 cm3satisfy a condition represented by the following formula (1):in-line-formulae description="In-line Formulae" end="lead"?0<dmax2×ns<6.5×10−4(cm−1).   (1)in-line-formulae description="In-line Formulae" end="tail"?

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