PURPOSE: To make it possible to set the distance between the surface of a sample and a spectroscope arbitrarily, by providing a condenser lens, ring shaped concave and convex mirrors, and a spectroscope optical system, and making laser light and light from a sample in parallel on the same axis between the concave and convex mirrors and the spectroscope optical system.
CONSTITUTION: A condenser lens 32 converges laser light 13 on the surface of a sample. A ring shaped concave mirror 34 and a convex mirror 36 make light 37 emitted from the sample to be a ring shaped parallel light beam, which is propagated in the reverse direction on the same axis. A ring shaped concave mirror 40 guides the light 37 from the sample to a spectroscope 22. A spectroscope optical system 20 includes expandable mirror tubes 46 and 46a. The laser light 13 and the light 37 from the sample are made to be in parallel on the same axis between the ring shaped concave and convex mirrors 34 and 36 and the spectroscope optical system 20. In this constitution, the light 37 from the sample is efficiently guided to a spectroscope 22 by the adjustment of the mirror tubes 46 and 46a, regardless of the length of the distance between the sample 16 and the spectroscope 22. Thus the highly accurate, general purpose device can be obtained.
OOHASHI ZENJI
KOSHIYU YASUKO
KONISHI MOTOYUKI
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