| 摘要 |
PROBLEM TO BE SOLVED: To provide the manufacture by which an optical element for ultraviolet rays can be manufactured while inhibiting reduction in ultraviolet transmissivity of the element. SOLUTION: This manufacture comprises pressing heated and softened quartz glass 1 with molds 2 and 3 which have forming surface shapes nearly the same as those of the optical-functional surfaces of an optical element respectively and to which pressure is applied, to transfer the forming surface shapes of the molds 2 and 3 to the quartz glass 1, wherein the atmosphere used at the time of performing the heating or cooling operation, contains at least gaseous hydrogen and the atmosphere used at the time of performing the forming operation, is vacuum or contains at least gaseous hydrogen.
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