| 摘要 |
PROBLEM TO BE SOLVED: To provide an OCT device capable of supplying a high-resolution and wide-range tomogram. SOLUTION: One of low coherent lights bisected by a light branching element 12 is emitted toward a test body T, reflected by the test body T, and directed again toward the light branching element 12 as measuring light. The other low coherent light is reflected by a mirror 141, and directed again toward the light branching element 12 as reference light. Measuring light and reference light interfere with each other at the light branching element 12, and are detected as interference light by a light detection element 13. As the mirror 141 is moved reciprocatingly, the optical length on the reference light side varies continuously. Therefore, the depth direction of the test body T is swept. As the mirror 141 is moved by a slider crank mechanism, a wide range in the depth direction of the test body T is swept at high speed.
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