Nondestructive refractive index measurement based on computational light-in-flight imaging

Zhi-guan Wang; Ming-jie Sun

doi:10.1117/12.2690725

6 November 2023 Nondestructive refractive index measurement based on computational light-in-flight imaging

Zhi-guan Wang, Ming-jie Sun

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129212L (2023) https://doi.org/10.1117/12.2690725
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

Refractive index is an important factor that will affect the performance of gradient-index optical fibers, and the refractive index of a gradient-index optical fiber is usually measured by the preform of it. However, the size of a gradient-index optical fiber preform is large, while the sample size that can fit into the index measuring instruments is limited. Therefore, the refractive index distribution of a fiber preform is usually determined in a destructive way. A small measurement sample should be cut off from the preform, which may damage the whole preform. Here, we proposed a nondestructive refractive index measuring method based on computational light-in-flight imaging, and we demonstrate the feasibility of the proposed method by measuring the refractive index of curved optical fibers and a gradient-index medium.

Citation Download Citation

Zhi-guan Wang and Ming-jie Sun "Nondestructive refractive index measurement based on computational light-in-flight imaging", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129212L (6 November 2023); https://doi.org/10.1117/12.2690725

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KEYWORDS

GRIN lenses

Refractive index

Optical fibers

Single photon avalanche diodes

Cameras

Nondestructive evaluation

3D modeling

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