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交叉偏振图像不但可以反映样品的偏振敏感结构信息,而且可以更好地反映出样品浅表层的微结构。因此利用光学相干层析成像技术(OCT)获取样品的交叉偏振图像越来越受到人们的关注。在前人的基础上,实现了一种基于单模光纤的新型全光纤交叉偏振光学相干层析成像系统(CP-OCT),该系统具有同时获得样品的交叉偏振信号和同向偏振信号的功能。详细介绍了CP-OCT系统信号的形成原理,并使用琼斯矩阵理论推导出交叉偏振信号和同向偏振信号的表达式。使用CP-OCT系统分别对玻璃片、中心波长为1310nm的λ/4波片及在体皮肤进行成像,从实验上验证了全光纤CP-OCT系统具有同时获取样品偏振敏感结构与偏振不敏感结构信息的能力。
Cross-polarized images not only reflect the polarization-sensitive structure of the sample information, but also better reflect the microstructure of the sample superficial layer. Therefore, the use of optical coherence tomography (OCT) to obtain samples cross-polarization images more and more attention. Based on the predecessors, a new CP-OCT based on single-mode fiber is developed, which has the function of obtaining the cross-polarization signal and the co-polarization signal of the sample simultaneously . The formation principle of CP-OCT system signal is introduced in detail, and the expressions of cross-polarization signal and co-polarization signal are derived using Jones matrix theory. The CP-OCT system was used to image the λ / 4 plate with the central wavelength of 1310nm and the in-vivo skin respectively. It was verified experimentally that the CP-OCT system has both the polarization-insensitive structure and the polarization-insensitive structure Information ability.