| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical device in which dislocation due to expansion of air is prevented in fixing an optical element on a holder by high temperature treatment. SOLUTION: In the optical device in which an optical element is fixed through a holder 7, the structure is characterized by fixedly holding two or more optical elements 6, 12 on both open faces of a tubular holder and by installing air vents 6a, 7b in either the optical elements or the holder.
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