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Theory of Fourier phase within the framework of Fourier-domain optical coherence tomography

机译:傅里叶域光学相干层析成像框架内的傅里叶相位理论

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Fourier phase in Fourier-domain optical coherence tomography (FD-OCT) has been shown to estimate the sub-resolution change in the optical depth location of a strong interface in refractive index profile of a sample using spectral-domain phase microscopy (SDPM), a derivative of FD-OCT. From first principles we show that in general Fourier phase not only estimates this sub-resolution change but also the mean spatial frequency of the coherence-gated refractive index, and both SDPM and depth-resolved spatial-domain low-coherence quantitative phase microscopy (dr-SLQPM) are special cases of this general theory. We also show that for spectral source with infinite bandwidth Fourier phase is zero. We provide analytical expressions and numerical simulations to support our results.
机译:傅立叶域光学相干断层扫描(FD-OCT)中的傅立叶相已被证明可以使用光谱域相显微镜(SDPM)估算样品折射率分布中强界面的光学深度位置的亚分辨率变化, FD-OCT的衍生产品。从第一原理我们可以看出,一般而言,傅立叶相不仅可以估算出这种亚分辨率的变化,而且还可以估算相干门控折射率的平均空间频率,还可以使用SDPM和深度分辨空间域低相干定量相显微镜(dr -SLQPM)是该通用理论的特例。我们还表明,对于具有无限带宽的频谱源,傅里叶相位为零。我们提供分析表达式和数值模拟以支持我们的结果。

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