High-resolution Tomography Imaging Optical Coherence Audience

Optical coherence tomography (OCT) is based on the detection of the low coherence between the light backscattered from within tissue and reflected from the reference mirror of an interferometer. It can generate images noninvasively and nondestructively and has wide application potential. Full-Field Optical Coherence Tomography (FF-OCT) is an extension of OCT. FF-OCT is based on the use of the parallel detection, broad bandwidth light illumination and high numerical aperture objectives. It can generate high resolution en face images at a high-speed without lateral scanning.In the thesis, a Linnik interference microscope-based FF-OCT system has been developed to obtain high-quality optical sectional images. First of all, based on the study of the imaging principles of FF-OCT, the imaging characteristic were discussed and the the methods of detecting, processing of the coherent signal were analyzed. Second, the key parts for realizing FF-OCT system were discussed. The design of the whole system was completed. Its performances and parameters were analyzed. The FF-OCT experimental system was then established. The improved Kohler illumination arrangement with a halogen lamp was used in the proposed FF-OCT system. Finally, en face tomographic images of an Intel Pentium4chip were retrieved from four sequential phase-shifted interferograms obtained by using PZT with a four-step algorithm. The work is helpful for the future research.