| 摘要 |
PROBLEM TO BE SOLVED: To easily distinguish a plurality of faces in an optical part in which coating with different characteristics is operated to a plurality of faces. SOLUTION: In an optical part 10 such as a laser crystal in which coating 1a and 1b with different characteristics is operated to a plurality of faces 10a and 10b, the size and/or shape of the coating 1a and 1b to be operated to each face is made different from each other. The size and/or shape of the coating operated to the plurality of faces is made different so that when each coating part is observed, the difference of the size or shape can be easily recognized. Then, each face can be easily distinguished, based on the size or shape. |
