Common path Fourier domain optical coherence tomography based on multiple reflections within the sample arm

Common path Fourier domain optical coherence tomography based on multiple reflections within the sample arm
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基于样本臂内多次反射的公共路径傅里叶域光学相干断层扫描

DOI:
10.1016/j.optcom.2011.02.073
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发表时间:
2011
影响因子:
2.4
通讯作者:
Krstajic N
Krstajic N
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Krstajic N

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我们提出了一种共路傅里叶域光学相干层析成像(FDOCT)系统,其中参考信号来自于样品臂内的多次反射。第一种是基于反射显微镜物镜,而第二种是基于正常(折射)显微镜物镜。第二种配置实际上是一个Mireau干涉仪。我们提出了一个敏感性分析,这些设置和图像在体内皮肤。两种公共路径布置的优点包括:1)参考表面不靠近样品表面,同时保持光路长度匹配(因此不需要额外的干涉仪),以及2)用户可以独立地控制参考和样品臂功率。此外,使用折射物镜的配置确保相干门和聚焦门始终匹配。缺点是在某些情况下参考臂功率不是最佳的(即接近于使CCD饱和)。然而,这个问题可以通过足够输出功率的光源来解决。我们相信这个想法是可扩展的,因此对内窥镜应用感兴趣。
We present a common path Fourier domain optical coherence tomography (FDOCT) setup where the reference signal arises from multiple reflections within the sample arm. Two configurations are demonstrated. The first is based on a reflective microscope objective while the second is based on a normal (refractive) microscope objective. The second configuration is effectively a Mireau interferometer. We present a sensitivity analysis of these setups and images of in vivo skin. Advantages of both common path arrangements include: 1) the reference surface is not close to the sample surface while keeping the optical path lengths matched (so the additional interferometer is not needed) and 2) the user can independently control reference and sample arm power. Additionally, the configuration using the refractive objective ensures that the coherence gate and focus gate always match. A disadvantage is that the reference arm power in certain circumstances is not optimal (i.e. close to saturating the CCD). However, this issue can be removed by a light source of sufficient output power. We believe the idea is scalable and therefore of interest to endoscopy applications.
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