| 摘要 |
PROBLEM TO BE SOLVED: To provide a diffraction element comprising a glass substrate in which a diffraction portion diffracting incident light has been formed as a diffraction element having a nonconventional configuration, and a method for fabricating the same. SOLUTION: The diffraction element comprises the glass substrate in which the diffraction portion diffracting incident light has been formed, wherein the glass substrate contains Ag and at least one element (element X) selected from metals nobler than Ag, and the diffraction portion is formed within the glass substrate by distributing the element X as shown by the following (a) and (b); (a) areas A having a relatively high concentration of the element X and an area B having a relatively low concentration of the element X are formed in the diffraction portion, (b) the areas A extend in a predetermined direction in the glass substrate, and when a section perpendicular to the predetermined direction in the diffraction portion is seen, at least part of the areas A are periodically arranged in the area B as a matrix. COPYRIGHT: (C)2008,JPO&INPIT
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