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1、Pure&Appl.Chern.,Vol.54,No.4,pp.819—831+,1982.00334545/82/040819—16$03.OO/OPrintedinGreatBritain.PergamonPressLtd©1982IUPACTRACEANALYSISANDULTRAPURIFICATIONOFMATERIALSFOROPTICALWAVEGUIDETECHNOLOGYJamesW.MitchellBellLaboratories,MurrayHill,NewJersey0797!t,USAAbstract—Inthetelecommunicati
2、onsindustrytechniquesforpurifyingandcharacterizingmaterials,andanalyticalmethodsforsolvingchemicalproblemshavebeenvitallyimportantfortechnologicalprogress.Theapplicationofreliableanalyticalmethodstodetermineoptimumconditionsforpre—paringmaterialsincontrolledstatesofpuritycontinuestobees
3、sential.Infact,theproductionofmaterialswithuniqueproperties,determinedbydopingpreciselywithimpuritiesontheonehandorbyinsuringtheabsenceofotherdetrimentalones,continuestobeakeytotechnologicaladvancement.Themostrecentcriticalneedintheindustryforpurematerialsandultratraceanalysisresultedfr
4、omtheinitiationofappliedresearchanddevelopmentofopticalwave—guidesystems,wheretolerancelimitsforwaveguidematerialswereprojectedtobeinthe2to100ng/grangeforcommonlyfoundtransitionmetalimpuritiesFe,Co,Cr,Cu,Mn,Ni,andV.Applicationsofneutronactivation,X—rayfluorescence,atomicabsorption,andla
5、serintracavityabsorptionspectro—scopyinsupportofopticalwaveguideprogramswillbediscussed.Exampleswillbeprovidedtodemonstratetheuseofthesetechniquesforscreeningcommerciallyavailableglass—makingrawmaterialsandchemicalvapordepositionreagents,forunequivocallyidentifyingimpuritiesinglassesand
6、fibers,andfordetectingsourcesofcontaminationduringglass—makingandfiberdrawing.Intheabsenceofmaterialsofsufficientpurityfromavailablecommercialsources,specializedpreparationshavebeenperformedundercontrolledexecutionsofsolventextraction,ionexchange,mercurycathodeelectrolysis,andlowtempera
7、turesublimation.Theadvantagesandpitfallsofthesemethodswillbecompared.Itwillbedemonstratedthatradioisotopetechniquesandactivationanalysisarethemostpowerfulandreliabletoolsforestablishingoptimumcon-ditionsforexecutingtheseproceduresandforpinpointingspecificdeficienciesofeachpurif
