PROBLEM TO BE SOLVED: To provide an OCT apparatus capable of acquiring highly accurate information about a subject in different depth ranges, using a simple structure.SOLUTION: An OCT apparatus splits light from a light source into measurement light and reference light, projects the measurement light onto a subject, and detects interference light between a return of the measurement light from the subject and the reference light. The OCT apparatus includes a dispersion unit and an information generation unit. The dispersion unit relatively changes a dispersion characteristic of a measurement light optical path which is an optical path of the measurement light and a dispersion characteristic of a reference light optical path which is an optical path of the reference light, according to an operation mode corresponding to a depth range. The information generation unit generates information about the subject according to the operation mode, based on a detection result of the interference light.SELECTED DRAWING: Figure 3【課題】簡素な構成で、異なる深さレンジで被測定物体に関する高精度な情報の取得が可能なＯＣＴ装置を提供する。【解決手段】ＯＣＴ装置は、光源からの光を測定光と参照光とに分割し、測定光を被測定物体に照射し、被測定物体からの測定光の戻り光と参照光との干渉光を検出する。ＯＣＴ装置は、分散部と、情報生成部とを含む。分散部は、測定光の光路である測定光路の分散特性と参照光の光路である参照光路の分散特性とを深さレンジに対応した動作モードに応じて相対的に変更する。情報生成部は、干渉光の検出結果に基づいて、動作モードに応じた被測定物体の情報を生成する。【選択図】図３
