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1、PHYSICALOPTICSTransmissionoffemtosecondlaserpulsesthroughanopticalfiberaL.N.Asnis,Ya.V.Grachev,I.Yu.Denisyuk,andO.A.SmolyanskayaSt.PetersburgStateUniversityofInformationTechnologies,Mechanics,andOptics,St.PetersburgSubmittedNovember13,2009OpticheskiZhurnal77,36May2010Thisarticle
2、discussesquestionsofhowthepulsewidthofafemtosecondfiberlaser,itsspectrum,andtheenvelopeofitsspectrumvarywhenthepulsepassesthroughsingle-modeandmultimodequartzopticalfibersabout1mlong.©2010OpticalSocietyofAmerica.INTRODUCTIONanEFOA-SHerbiumfiberlaserAvestawithameanout-putpowerof137mWat
3、afrequencyof50MHz,havingInanumberofappliedproblems,itisnecessarytotrans-125-fspulsewidthandoperatingatawavelengthofmitfemtosecondlaserpulsesthroughanopticalfiberwhile1.56m;maintaininghighelectricfieldsofthelightwave.Inparticu-anFL-1laserwithactivemediumYb:KYWSolarwithalar,thisisneed
4、edtocreatephasedantennaarraysofTHz-meanoutputpowerof1Watafrequencyof75MHz,waveradiatorsbasedonfibersplittersandnonlinearopticalhavingpulsewidth150200fsandoperatingatawave-materials.Suchradiatorsarepromisingforcreating2-Dandlengthof1.04m.3-Dactiveimagesystemsfordetectingdangerousobjec
5、tsinthestrugglewithterrorism.Thelaserradiationwasintroducedintothefiberandex-Itiswellknownthat,whenalaserpulseistransmittedtractedfromitbymeansofmicrolenses10and3.5.throughanopticalfiber,theparametersofthispulsetheTheradiationattheoutputoftheopticalfiberwasana-width,thespectrum,andt
6、heenvelopeofthespectrumcanlyzedbymeansofaspectrometermodelASP-IRandavaryasafunctionoftheparametersofthefiber,thepulsesingle-pulsefemtosecondautocorrelatormodelASF-200,width,thefrequencyspectrumoftheradiation,andthein-14andthemeanpowerwasmeasuredusingcalibratedcalorim-tensityofthe
7、inputradiation.eters.Questionsofminimizingthedistortionsofpicosecondlightpulseswhentheyaretransmittedthroughagradient4,5opticalfiberhavebeenconsideredinanumberofpapers.Forasteppedsingle-modefiberwithrelativelylowinputRESULTSANDDISCUSSIONpowerdensitiesatawavelengthof1.55m,thewidthofthe
8、Figure1shows
