measuring the spatial polarization distribution of multimode beams emerging

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1、October15,2010/Vol.35,No.20/OPTICSLETTERS3429Measuringthespatialpolarizationdistributionofmultimodebeamsemergingfrompassivestep-indexlarge-mode-areafibers1,1112DanielFlamm,*OliverA.Schmidt,ChristianSchulze,JuliaBorchardt,ThomasKaiser,31SiegmundSchröter

2、,andMichaelDuparré1InstituteofAppliedOptics,Friedrich-Schiller-UniversityJena,Fröbelstieg1,D-07743JenaGermany2InstituteofAppliedPhysics,Friedrich-Schiller-UniversityJena,Max-Wien-Platz1,D-07743JenaGermany3InstituteofPhotonicTechnology,Albert-Einstein-S

3、trasse9,D-07745JenaGermany*Correspondingauthor:daniel.flamm@uni‑jena.deReceivedJuly20,2010;acceptedSeptember11,2010;postedSeptember22,2010(Doc.ID131686);publishedOctober12,2010Wemeasurethepolarizationstateofeachguidedtransversalmodepropagatinginstep-in

4、dexlarge-mode-areafibers(V≈4)usingacorrelation-filterbasedmeasurementtechniqueincombinationwithaStokesparametermeasure-ment.Theentireemergingbeam,expressedintermsofaphase-dependentsuperpositionoflinearlypolarizedmodes,demonstratesspatiallyvaryingpolari

5、zationproperties.Byknowingtheinformationaboutmodalamplitudesandphasedifferences,fullinformationabouttheopticalfieldisavailable.©2010OpticalSocietyofAmericaOCIScodes:060.2310,140.3295,260.5430,120.3940,060.2270,140.0140.Infacingthechallengeofguidingalre

6、adyhighandyetin-orthogonaleigenfunctions.InEq.(1)thecomplexmodecreasinglaserpowertoitsplaceofapplication,theuseofcoefficientsclg¼ϱlgexpðiϕlgÞareused.Eachpairofpo-step-indexlarge-mode-area(LMA)fibersrepresentsapro-larizationdegeneratedeigenstatescanbeco

7、mbinedtomisingapproach.Thesewaveguidesallowthetransportofonemode:opticalpowerinthemultikilowattrangewithoutdegrada-tionandwithoutgeneratingnonlineareffects.However,lXmaxincreasingtheeffectivemodeareaenablestheexcitationUðrÞ¼ψðrÞcl1;ð2Þlcofhigher-orde

8、rmodeshavingagreatinfluenceonessen-l¼1l2tialbeamproperties,suchasthebeam-propagationratioandbeam-pointingstability[1].InthisLetter,weconcen-ltrateonthepolarizationstatesoftheoccurringmodesXmaxϱl1whosesuperpositionleadstoanemergingbeam