偏振敏感光学相干层析术可对生物双折射组织进行功能成像,然后通过分析相位延迟就可得到生物组织的信息。分析了单一入射偏振态对双折射相位延迟准确度的影响。首先提出了系统的理论模型,然后进行MATLAB模拟分析,最后通过实验进一步验证了理论模型的结果。通过MATLAB得到的图像以及实验结果可以看出:在样品具有确定的相位延迟量以及确定的光轴方向时,当线偏振入射光的偏振方向与光轴夹角为0°或者90°时,或当正椭圆入射光的偏振方向与光轴夹角为45°时,相位延迟的测量误差最小。

Polarization-sensitive optical coherence tomography (PS-OCT) is a functional imaging technique for biological birefringence tissues. The information contained in the biological tissue can be extracted by analyzing the phase delay. Herein, the influence of polarization state of single incident light on the phase delay accuracy caused by tissue birefringence is analyzed. Initially, the theoretical model is proposed. Subsequently, simulations using MATLAB are performed and finally the theoretical model is verified by experimental measurements. Results obtained by MATLAB along with experimental results show that, when a sample with a fixed amount of phase retardation and a fixed direction of optical axis, and when the orientation is 0° and 90° for the incident linearly polarized light or 45° for the incident elliptically polarized light, the phase retardation measurement error has the smallest value.