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首页> 外文会议>Optical coherence tomography and coherence domain optical methods in biomedicine XIV >Twofold improvement in axial resolution of Optical Coherence Tomography by four pass sample probing
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Twofold improvement in axial resolution of Optical Coherence Tomography by four pass sample probing

机译：通过四遍样品探测，光学相干断层扫描的轴向分辨率提高了两倍

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摘要

In this contribution a proof of concept for the alternate way of twofold increasing the axial resolution of Optical Coherence Tomography systems is shown. On the contrary to expanding the bandwidth of the light source, the number of passes of light between sample and the Michelson interferometer is increased. In two simplified novel configurations of Spectral OCT devices designed for this research, the interferometer is equipped with polarization controlling elements in order to force light to pass the distance from the beam splitter to the sample four times: during the first pass the initial linear polarization of the probing beam is converted to the perpendicular one and on return to the interferometer deflected by the polarization sensitive beam splitter towards the additional mirror reflecting it back to the sample. After the second pass the state of polarization is changed again and restored to the initial one in order to interfere with the reference beam. As a result in both set-ups optical paths difference between both arms of the Michelson interferometer is twofold longer comparing to the standard system. This results in two times smaller axial calibration coefficient and finally twofold increase of an effective axial resolution for the same coherence length of the light source. In the paper the experimental evidences are given and limitations of the method discussed.
机译：在这一贡献中，示出了光学相干断层扫描系统的轴向分辨率的两倍增加的替代方式的概念证明。与扩大光源的带宽相反，样品与迈克尔逊干涉仪之间的光通过次数增加了。在为该研究设计的两种简化的光谱OCT装置的新颖配置中，干涉仪配备了偏振控制元件，以迫使光四次通过从分束器到样品的距离：在第一次通过过程中，探测光束被转换为垂直光束，并返回到由偏振敏感分束器偏转的干涉仪，朝着将其反射回样品的附加镜偏转。在第二次通过之后，偏振状态再次改变并恢复到初始状态，以便与参考光束发生干涉。结果，在两个设置中，迈克尔逊干涉仪的两个臂之间的光程差比标准系统长两倍。对于相同的相干长度，这将导致轴向校准系数减小两倍，并最终使有效轴向分辨率提高两倍。本文给出了实验证据并讨论了该方法的局限性。

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