Abstract: There is provided an optical coherent tomography device capable of enlarging a measurement range by removing the affect of a folded image. The device includes an optical phase modulator (14) enabling operation amplifiers (17, 18) and a calculation control device (21) to measure a first intensity as a cosine function for the wave number and a second intensity as a sine function or inverse code function for the wave number from the intensity of the output light multiplexed by a third coupler (16). The calculation control device (21) is based on a first intensity set and a second intensity set of the output light by the optical phase modulator (14) measured by the operation amplifiers (17, 18) and the like, so as to suppress generation of a folded image and identify reflection or a backscattering position and a reflection intensity or a back scattering intensity of the measurement light for the irradiation direction of the measurement light in the measurement object.

Abstract: The present invention provides an OCT technique that permits tomographic observation of a biological body parts that is difficult to restrain and also provides a tomographic observation technique for the observation of a constrainable part that does not require constraint and remove the burden from biological body. A wavelength-tunable light generator (wavelength-tunable light source) is employed as the light source of the optical coherence tomography device. The wavelength-tunable light generator has a wave number tunable range width of at least 4.7×10?2 ?m?1 and an emitted-light frequency width of no more than 13 GHz, for example, and includes means capable of changing the wave number stepwise at wave number intervals of no more than 3.1×10?4 ?m?1 and time intervals of no more than 530 ?s.

Abstract: The present invention provides an OCT technique that permits tomographic observation of a biological body parts that is difficult to restrain and also provides a tomographic observation technique for the observation of a constrainable part that does not require constraint and remove the burden from biological body. A wavelength-tunable light generator (wavelength-tunable light source) is employed as the light source of the optical coherence tomography device. The wavelength-tunable light generator has a wave number tunable range width of at least 4.7×10?2 ?m?1 and an emitted-light frequency width of no more than 13 GHz, for example, and includes means capable of changing the wave number stepwise at wave number intervals of no more than 3.1×10?4 ?m?1 and time intervals of no more than 530 ?s.