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Fiber motion-insensitive fiber-based polarization-sensitive optical coherence tomography for optic axis determination
Journal of the Optical Society of America B ( IF 1.9 ) Pub Date : 2020-02-06 , DOI: 10.1364/josab.376808
Zenghai Lu , Cheng Liu

Polarization-sensitive optical coherence tomography (PS-OCT) is widely used to image fibrous biological tissues, providing additional image contrast compared to intensity-based OCT, including birefringence and optic axis orientation information. Here a theoretical and experimental analysis of the effect of the system fiber on determination of sample optic axis orientation using a previously reported algorithm based on the angle between Stokes vectors on the Poincaré sphere in fiber-based PS-OCT experimentally confirms that the algorithm only works correctly when the parameters of the system fiber are kept constant during the imaging acquisition of each frame. To extend the use of the algorithm to situations in which the parameters of the system fiber are varied among A-scans or image frames, which is true when the OCT probe scanning does move the sample arm fiber, we propose the use of polarization maintaining fiber (PMF) with a special polarization axis orientation as the sample arm fiber for extracting sample optic axis orientation using fiber-based PS-OCT systems. The use of the PMF makes the system insensitive to variations of the sample fiber birefringence for determining optic axis orientation by automatically removing the offset ambiguity from each A-scan. We demonstrated by using a computer evaluation model that the proposed method is capable of extracting the relative optic axis orientation correctly when the PMF birefringence is varied among A-scans due to external disturbances to the system fiber, provided that the polarization axis orientation (slow or fast) of the PMF is kept constant during the measurement.

中文翻译:

光纤运动不敏感的基于光纤的偏振敏感光学相干层析成像,用于确定光轴

偏振敏感光学相干断层扫描(PS-OCT)广泛用于对纤维生物组织进行成像,与基于强度的OCT相比,提供了额外的图像对比度,包括双折射和光轴方向信息。在此,使用先前报道的基于光纤PS-OCT中庞加莱球上斯托克斯矢量之间的角度的算法,对系统光纤对样品光轴方向确定的影响进行理论和实验分析,实验证明该算法仅适用当在每个帧的成像采集过程中将系统光纤的参数保持恒定时,可以正确地进行设置。为了将算法的使用扩展到系统纤维参数在A扫描或图像帧之间变化的情况,当OCT探针扫描确实移动了样品臂光纤时,这是正确的,我们建议使用具有特殊偏振轴方向的偏振保持光纤(PMF)作为样品臂光纤,以使用基于光纤的PS-OCT提取样品光轴方向系统。通过自动从每个A扫描中消除偏移模糊度,PMF的使用使系统对于确定光轴方向的样品光纤双折射的变化不敏感。我们通过使用计算机评估模型证明,当偏振光轴取向(慢或慢)时,由于系统光纤的外部干扰,A扫描之间的PMF双折射发生变化时,该方法能够正确提取相对光轴取向。在测量过程中,PMF保持恒定。
更新日期:2020-03-02
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