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Analysis of polygonal mirror scanning heads: from industrial to high-end applications in swept sources for OCT

机译：多边形反射镜扫描头的分析：从工业到高端应用的OCT扫描源

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摘要

An analysis of polygonal mirror (PM) scanning heads has been performed, in order to provide a tool for their optimal design. The theory developed brings under the same umbrella applications that range from industrial dimensional measurements to high-end biomedical imaging, for example for broadband laser sources swept in frequency for Swept Source Optical Coherence Tomography (SS-OCT). The different characteristic parameters of the PM scanning heads were considered in order to achieve a rigorous analysis: number of PM facets, inner radius of the PM, eccentricity of the PM pivot with regard to the incident fixed laser beam, distance from this beam to the principal plane of the objective lens, and angular velocity of the PM. The functions that characterize the PM scanning head have been deduced: scanning function and velocity, characteristic angles, duty cycle, and two migration functions (longitudinal and transversal) that allow for an optimized designing calculus of the PM placed in different SS configurations. The analytic and numerical analysis of these functions has been performed with regard to the characteristic parameters of the scanning head. Experimental validations of the theory were further completed. While the above analysis has been carried out for a characteristic ray of the collimated laser beam (i.e., its central axes), it also allows for considering in a simple way the finite diameter of the beam. Thus, a discussion on the deformation of the beam - as produced by the eccentric rotational PM facet - can also be perfomed. A comparison of the PM scanner with the most common types of laser scanners highlights its advantages and drawbacks for OCT.
机译：为了提供优化设计的工具，已经对多角镜（PM）扫描头进行了分析。所开发的理论处于从工业尺寸测量到高端生物医学成像的相同保护伞应用范围内，例如，针对扫频光学相干断层扫描（SS-OCT）扫频的宽带激光源。为了进行严格的分析，考虑了PM扫描头的不同特征参数：PM面的数量，PM的内半径，PM枢轴相对于入射的固定激光束的偏心距，从该束到激光束的距离。物镜的主平面和PM的角速度。推导了表征PM扫描头的功能：扫描功能和速度，特征角度，占空比以及两个迁移功能（纵向和横向），这些功能可以优化设计放置在不同SS配置中的PM的演算。关于扫描头的特征参数，已经对这些功能进行了分析和数值分析。该理论的实验验证进一步完成。尽管已经对准直激光束的特征射线（即其中心轴）进行了上述分析，但它也允许以简单的方式考虑光束的有限直径。因此，也可以对由偏心旋转PM面产生的光束变形进行讨论。将PM扫描仪与最常见的激光扫描仪类型进行比较，可以看出其对OCT的优缺点。

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