Analysis of intermediary scan-lens and tube-lens mechanisms for optical coherence tomography
Analysis of intermediary scan-lens and tube-lens mechanisms for optical coherence tomography
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DOI：
10.1364/ao.55.000646
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发表时间：
2016-02-01
期刊：
影响因子：
1.9
通讯作者：
Pashaie, Ramin
中科院分区：
文献类型：
--
作者：
Atry, Farid;Pashaie, Ramin
将光学相干断层扫描（OCT）扫描仪与光遗传神经刺激或荧光成像等其他技术相结合，需要将辅助组件集成到设备的光路中。由于大多数OCT物镜的扫描距离较短，在设备中添加扫描透镜和管状透镜是必要的，以打开物镜的后焦平面和振镜的质心之间的空间。本文从理论上探讨了三种不同设计的扫描透镜和管透镜对使用现成元件的扫描仪焦斑尺寸的影响。在定制的OCT扫描仪中实现并测试了两个透镜机构，以实验测量点扩展函数。根据我们的分析，当用作扫描/管透镜时，适当形式的四元半普洛索透镜与消色差双透镜相比具有优越的性能。前镜头设计提供接近衍射限制的分辨率扫描角度高达6.4度；然而，由于消色差双重像差，后来的设计提供衍射限制的分辨率限制在2度扫描角。(C) 2016年美国光学学会
Combining an optical coherence tomography (OCT) scanner with other techniques such as optogenetic neurostimulation or fluorescence imaging requires integrating auxiliary components into the optical path of the setup. Due to the short scanning distance of most OCT objectives, adding scan and tube lenses in the device is essential to open space between the back-focal-plane of the objective and center of mass of the mirrors in the galvanometer. The effect of the scan and tube lenses on the focal spot size of the scanner using off-the-shelf components are theoretically explored for three different designs in this paper. Two lens mechanisms were implemented and tested in a custom-built OCT scanner to experimentally measure point-spread functions. Based on our analysis, proper form of a four-element semi-Plossl lens provides a superior performance compared with an achromatic doublet when used as a scan/tube lens. The former lens design provides close to diffraction-limited resolution for scan angles up to 6.4 degrees; however, due to aberrations in an achromatic doublet, the later design offers diffraction-limited resolution confined to 2 degrees scan angles. (C) 2016 Optical Society of America