We report an elliptical beam design for aberration mitigation in high-resolution optical coherence tomography (OCT). We polished a large angle on the fiber terminal facet in the sample arm to make a non-rotational symmetric beam with different numerical apertures (NA) for the two axes vertical to the optical axis. By sacrificing the resolution in the out-of-plane transverse direction, the elliptical beam mitigated the aberration introduced by the focusing optics in the OCT system. The elliptical beam with a doubled NA in the in-plane transverse direction promoted the axial field-of-view (FOV) by about 50% and increased the signal back-coupling efficiency by about 25%. We verified the feasibility of the design by imaging the USAF 1951 resolution chart, swine cornea ex vivo , and human skin in vivo . Results show that the proposed method relieves aberration-related problems in high-resolution OCT.

中文翻译：

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实现椭圆光束设计的高分辨率光学相干断层扫描中的像差减轻

我们报告了一种用于在高分辨率光学相干断层扫描 (OCT) 中减轻像差的椭圆光束设计。我们在样品臂的光纤端面上抛光了一个大角度，以制作一个非旋转对称光束，其两个垂直于光轴的轴具有不同的数值孔径 (NA)。通过牺牲面外横向的分辨率，椭圆光束减轻了 OCT 系统中聚焦光学器件引入的像差。在面内横向方向上具有加倍 NA 的椭圆光束将轴向视场 (FOV) 提高了约 50%，并将信号后耦合效率提高了约 25%。我们通过对美国空军 1951 年分辨率图表、猪角膜进行成像来验证设计的可行性离体和人体皮肤 体内。结果表明，所提出的方法缓解了高分辨率 OCT 中与像差相关的问题。