中文摘要：

分析了光学相于层析（OCT）成像系统的色散特性。分析表明，系统色散与振镜离焦量成正比关系，且在一倍焦距以内为负色散，在一倍焦距以外为正色散。设计了纵向分辨率为8μm的OCT系统，测得振镜位于傅里叶透镜焦点外0．5mm处时，系统产生的色散值约为77fs^2，实验结果与理论相符合。

英文摘要：

The dispersion characteristics of optical coherence tomography （OCT） system were particularly analyzed. It is found that the dispersion is proportion to the defocus distance of a galvanometer, with negative in the focus length, dispersion, and with possive dispersion out the focus length. A OCT with spatial resolution of 8 μm is designed. The dispersion of 77 fs^2 is measured in this OCT system when the galvanometer is 0.5 mm far away from the focal length of Fourier lens. The relation between dispersion and the distance away from focus is experimentally validated, and the experimental results are agreed with theory well.