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dc.contributorVirginia Tech
dc.contributor.authorHill, Cary
dc.contributor.authorHoma, Dan
dc.contributor.authorYu, Zhihao
dc.contributor.authorCheng, Yujie
dc.contributor.authorLiu, Bo
dc.contributor.authorWang, Anbo
dc.contributor.authorPickrell, Gary
dc.identifier.citationHill, C.; Homa, D.; Yu, Z.; Cheng, Y.; Liu, B.; Wang, A.; Pickrell, G. Single Mode Air-Clad Single Crystal Sapphire Optical Fiber. Appl. Sci. 2017, 7, 473.
dc.description.abstractThe observation of single mode propagation in an air-clad single crystal sapphire optical fiber at wavelengths at and above 783 nm is presented for the first time. A high-temperature wet acid etching method was used to reduce the diameter of a 10 cm length of commercially-sourced sapphire fiber from 125 micrometers to 6.5 micrometers, and far-field imaging provided modal information at intervals as the fiber diameter decreased. Modal volume was shown to decrease with decreasing diameter, and single mode behavior was observed at the minimum diameter achieved. While weakly-guiding approximations are generally inaccurate for low modal volume optical fiber with high core-cladding refractive index disparity, consistency between these approximations and experimental results was observed when the effective numerical aperture was measured and substituted for the theoretical numerical aperture in weakly-guiding approximation calculations. With the demonstration of very low modal volume in sapphire at fiber diameters much larger than anticipated by legacy calculations, the resolution of sapphire fiber distributed sensors may be increased and other sensing schemes requiring very low modal volume, such as fiber Bragg gratings, may be realized in extreme environment applications.
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)*
dc.subjectsapphire optical fiber
dc.subjectsingle mode optical fiber
dc.subjectdistributed sensing
dc.titleSingle Mode Air-Clad Single Crystal Sapphire Optical Fiberen_US
dc.typeArticle - Refereeden_US
dc.title.serialApplied Sciences

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Creative Commons Attribution 4.0 International (CC BY 4.0)
License: Creative Commons Attribution 4.0 International (CC BY 4.0)