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Single Mode Air-Clad Single Crystal Sapphire Optical Fiber

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dc.contributor.authorHill, Caryen
dc.contributor.authorHoma, Daniel S.en
dc.contributor.authorYu, Zhihaoen
dc.contributor.authorCheng, Yujieen
dc.contributor.authorLiu, Boen
dc.contributor.authorWang, Anboen
dc.contributor.authorPickrell, Gary R.en
dc.contributor.departmentMaterials Science and Engineering (MSE)en
dc.date.accessioned2017-07-31T15:07:13Zen
dc.date.available2017-07-31T15:07:13Zen
dc.date.issued2017-05-03en
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.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
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.en
dc.identifier.doihttps://doi.org/10.3390/app7050473en
dc.identifier.issue5en
dc.identifier.urihttp://hdl.handle.net/10919/78492en
dc.identifier.volume7en
dc.language.isoenen
dc.publisherMDPIen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectsapphire optical fiberen
dc.subjectsingle mode optical fiberen
dc.subjectdistributed sensingen
dc.titleSingle Mode Air-Clad Single Crystal Sapphire Optical Fiberen
dc.title.serialApplied Sciencesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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