| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of correct setting of resonator length and parallelism between a reflection plane and an output coupler, in an unstable resonator in which at least one of the reflection plane and the output coupler has a flat surface or a very gentle curvature surface. SOLUTION: The unstable resonator is provided with a parallelism adjusting device 10 which adjusts optical parallelism between the reflection plane 7 and the output coupler 6. The parallelism adjusting device 10 is constituted by a holding member 11 which holds the output coupler 6, and a holding member 12 which holds the reflection plane 7. Wherein, on the holding members 11 and 12, a first fitting surface 11A and a second fitting surface 12A are formed respectively, so as to be abutted each other by one and the other of a concave spherical surface and a convex spherical surface having the same curvature, or one and the other of a concave conical surface and the convex spherical surface, and by mutually sliding and swinging both fitting surfaces while abutting them, the resonator length is accurately set, and the parallelism between the reflection plane and the output coupler is adjusted. COPYRIGHT: (C)2009,JPO&INPIT
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