University of Kent, School of Physical Sciences, Applied Optics Group, Gilles Lane, Canterbury, Kent CT2 7NH United Kingdom.
J Biomed Opt. 2011 Jul;16(7):076010. doi: 10.1117/1.3598446.
A Fourier domain optical coherence tomography setup is presented built around an optical configuration that exhibits Talbot bands. A low astigmatism spectrometer is used, employing a spherical mirror and a cylindrical lens between a diffraction grating and a linear CCD camera. To produce Talbot bands, the two interferometer beams--object and reference--are laterally shifted in respect to each other in their way toward the diffraction grating. This allows attenuation of mirror terms and optimization of the sensitivity profile. We evaluate the optimization of the sensitivity profile with depth, in respect to its overall strength and its position peak, which can be shifted toward a larger optical path difference in the interferometer. We demonstrate the efficiency of such a configuration at large depths by imaging a thick phantom and human skin in vivo for different values of the lateral distance between the two beams.
介绍了一种基于展示泰伯带的光学配置的傅里叶域光学相干断层扫描设备。采用低像散光谱仪，在衍射光栅和线性 CCD 相机之间使用一个球面镜和一个柱面透镜。为了产生泰伯带，两个干涉仪光束——物光束和参考光束——在它们向衍射光栅的方向上彼此横向移动。这允许衰减镜项并优化灵敏度分布。我们评估了灵敏度分布在深度方面的优化，相对于其整体强度及其位置峰值，位置峰值可以向干涉仪中的较大光程差移动。我们通过对不同横向距离的两个光束的厚体模和人体皮肤进行成像，证明了这种配置在大深度下的效率。
