| 摘要 |
PROBLEM TO BE SOLVED: To obtain good tomographic animation images of the gullet, stomach, intestines, and the like, by obtaining an optical path variable optical system which is high in speed, is wide in a scan range, is less in the intensity change of light and is stable in temperature characteristics. SOLUTION: This optical tomographic diagnostic apparatus is provided with the optical path variable optical system 24 on a reference light side or signal light side at the time of taking an interference signal by dividing the low coherence light from a light source to the signal light and the reference light, and irradiating an observation object with the signal light, then synthesizing the signal light and the reference light again to cause interference and observers the tomographic image of the observation object by changing the optical path length. In such a case, the optical path variable optical system 24 comprises a single mode optical fiber 25 for introduction, a collimator lens 29, a condenser lens 31, a single mode optical fiber 26 for take-out and optical elements 271 and 272 having the faces parallel to each other. The light is passed even number times these optical elements 271 and 272 and is rotated, by which the optical path length is changed.
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