Wang, KePickrell, Gary R.2017-03-072017-03-072011-02-01Wang, K.; Pickrell, G. Long Period Gratings in Random Hole Optical Fibers for Refractive Index Sensing. Sensors 2011, 11, 1558-1564.1424-8220http://hdl.handle.net/10919/75296We have demonstrated the fabrication of long period gratings in random hole optical fibers. The long period gratings are fabricated by a point-by-point technique using a CO2 laser. The gratings with a periodicity of 450 µm are fabricated and a maximum coupling efficiency of −9.81 dB has been achieved. Sensing of different refractive indices in the surrounding mediums is demonstrated by applying standard liquids with refractive indices from 1.400 to 1.440 to the long period grating.1558 - 1564 (7) page(s)application/pdfenCreative Commons Attribution 4.0 InternationalTechnologyChemistry, AnalyticalElectrochemistryInstruments & InstrumentationChemistrylong period gratingrandom hole optical fiberpoint-by-pointrefractive index sensingSENSORFABRICATIONArticle - Refereedhttp://www.mdpi.com/1424-8220/11/2/1558https://doi.org/10.3390/s110201558112Pickrell, G [0000-0003-1782-9010]