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Novel multifocus tomography for measurement of microstructured and multicore optical fibers

机译：新型多焦点层析成像技术，用于测量微结构和多芯光纤

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摘要

A novel multifocus tomographic algorithm for reconstructing an optical fiber's cross sectional refractive index distribution from transverse projections is described. This new algorithm is validated against measurements of both microstructured and multicore optical fibers, which were not previously measurable. Optical fiber tomographic measurements recently made by several research groups using different technologies have all suffered from the same limitation, namely that typical fiber diameters (several hundred microns) exceed the imaging depth-of-field (approximately one micron) by several orders of magnitude. The new algorithm combines data acquired from a multiplicity of focal planes to overcome this limitation, yielding measurements with extremely fine spatial resolution over large transverse dimensions, thereby providing the first-ever high quality measurements of microstructured and multicore fibers. This new measurement approach is broadly applicable to any tomographic problem in which the depth-of-field is greatly exceeded by the transverse dimension of the specimen. Many types of transverse optical fiber measurement technologies, including interference microscopy, quantitative phase microscopy (QPM), residual stress measurement, differential interference contrast (DIC) microscopy, and spontaneous emission tomography will benefit from this new algorithm, which will greatly facilitate characterization of optical fibers for high-power applications.
机译：描述了一种新颖的多焦点层析成像算法，用于根据横向投影重建光纤的横截面折射率分布。该新算法针对以前无法测量的微结构光纤和多芯光纤的测量进行了验证。几个研究小组最近使用不同技术进行的光纤层析成像测量都受到相同的限制，即典型的纤维直径（几百微米）超过成像像场深度（约一微米）几个数量级。新算法结合了从多个焦平面获取的数据以克服此限制，从而在较大的横向尺寸上获得具有极高空间分辨率的测量结果，从而首次提供了微结构和多芯光纤的高质量测量结果。这种新的测量方法可广泛应用于任何层析成像问题，在该问题中，样品的横向尺寸大大超过了景深。这种新型算法将受益于多种类型的横向光纤测量技术，包括干涉显微镜，定量相显微镜（QPM），残余应力测量，微分干涉对比（DIC）显微镜和自发发射断层扫描，这将大大有助于光学特性的表征。大功率应用的光纤。

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