简介:CyclicvoltammetryandchronoamperometrywereusedtoinvestigatetheclectrochemicalbehaviorofFe(Ⅱ)andEr(Ⅲ)inaLiClO4-DMSO(dimethylsufoxide)systematPtandCuelectrodes.ExperimentalresultsindicatethatthereductionsofFe(Ⅱ)toFe(0)andEr(Ⅲ)toEr(0)wereirreversibleatPtandCuelectrodes.ThediffusioncoefficientandtheclectrontransfercoeffieientofFe(Ⅱ)ina0.01mol/LFeCl2-0.1mol/LLiClO4-DMSOsystemat303Kwere1.70×10^-10m^2/sand0.08respectively,thediffusioncoeffieientandtheelectrontransfercoefficientofEr(Ⅲ)ina0.01mol/LErCl3-0.1mol/LLiClO4-DMSOsystemat303Kwere1.47×10^-10m^2/sand0.108respectivealy.Thehomogeneous,strongadhesiveEr-FealloyfilmscontainingErof31.39%-42.12%inmassfractionwithmetalliclustrewerepreparedbypotentiostaticelectrolysisonaCuelectrodeinaErCl3-FeCl2-LiClO4-DMSOsystemat-1.75—-2.05V(vs.SCE).
简介:(EC+β+)Decayof153Erand157Yb¥XuShuwei;XieYuanxiang;PanQiangyan;ZhangJuping;ZhangXueqian;WangYihao;GeYuanxiu;YinXijin?..
简介:γ Decay of New Neutron-rich Nuclei 175ErγDecayofNewNeutron-richNuclei175Er¥ZhangXueqian;YuanShuanggui;YangWeifan;YuXian;...
简介:Inthisworkpulsegenerationinboththe1.5and2μmspectralrangesusingagrapheneoxide(GO)-paper-basedsaturableabsorberinEr-andTm-dopedfiberlasersispresented.ThearticledescribesthefabricationmethodofGOpaperanditscharacterization.Theperformanceofbothlasersisdiscussedindetail.Stable,mode-lockedoperationprovides613fsand1.36pssolitonpulsescenteredat1565.9and1961.6nminEr-andTm-dopedfiberlasers,respectively.Furthermore,scalingofspectralwidth,andhencethepulseduration,byincreasingthenumberofGOpaperlayersintheEr-dopedlaserisdescribed.TheversatilityandsimplicityofGOpaperfabricationcombinedwiththepossibilityofscalingtheopticalspectrumfullwidthathalf-maximumareessentialfeaturesthatmakeitagoodcandidateforultrafastlow-powermode-lockedlasersoperatingindifferentspectralregions.
简介:Atemperature-inducedspinreorientationtransitionbetweenГ4(Gx,Ay,Fz)andГ2(Fx,Cy,Gz)hasbeenstudiedinthefamilyofEr1–xYxFeO3(x=0,0.25,0.5,0.75,1)singlecrystals.BydopingnonmagneticY3+,wetunedthespinreorientationtemperaturetolowtemperaturewithincreasingx.Moreover,thetypicalcompensationpointandspinfliptransitionofErFeO3alsodecreaseswithdoping,anddisappearsabovex=0.75.WealsoreporttheRietveldrefinementsandRamanspectroscopyofEr1–xYxFeO3,wheresomeRamanpeaksareshiftedtolowfrequencywithincreasingdoping.Ourresultsshedlightontheunderstandingoftheinteractionbetweentwomagneticsub-latticesofrareearth(R3+)andiron(Fe3+)ions,andwillalsocontributetothematerialsdesignandpotentialapplications.
简介:ZnOfilmscontainingErandGenanocrystals(nc-Ge)weresynthesizedandtheirphotoluminescence(PL)propertieswerestudied.Visibleandnear-infraredPLintensitiesarefoundtobegreatlyincreasedinnc-Ge-containingfilm.Er-related1.54μmemissionhasbeeninvestigatedunderseveralexcitationconditionsupondifferentkindsofGe,ErcodopedZnOthinfilms.1.54μmPLenhancementaccompaniedbytheappearanceofnc-Geimpliesasignificantcorrelationbetweennc-GeandPLemissionofEr3+.Theincreasedintensityof1.54μminGe:Er:ZnOfilmisconsideredtocomefromthejointeffectofthelocalpotentialdistortionaroundEr3+andthepossibleenergytransferfromnc-GetoEr3+.
简介:Wereportonacompactpassivemode-lockedEr:fiberringlaseroperatedatthefundamentalrepetitionrateof517MHz,whichwebelieveisthehighestfundamentalrepetitionrateeverreportedinaringcavityfiberlaser.Thekeytechniqueistheemploymentoftwoinnovativehigh-powerwavelengthdomainmultiplexercollimatorswithallgainfibercavitysuitedforthehighpower(upto2W)pumping.Thelaserisfeaturedwithadirectchirpfreeoutputpulse,whichis97fswithoutextracavitycompressionatanaverageoutputpowerof90mW.
简介:Multilayerblackphosphorus(BP)nanoplateletsofdifferentthicknesseswerepreparedbytheliquidphaseexfoliationmethodanddepositedontoyttriumaluminumgarnetsubstratestoformsaturableabsorbers(SAs).Thesewerecharacterizedwithrespecttotheirthickness-dependentsaturableabsorptionpropertiesat3μm.TheBP-SAswereemployedinapassivelyQ-switchedEr:Lu2O3laserat2.84μm.ByusingBPexfoliatedindifferentsolvents,stablepulsesasshortas359nsweregeneratedatanaverageoutputpowerofupto755mW.Therepetitionrateintheexperimentwas107kHz,correspondingtoapulseenergyof7.1μJ.TheseresultsprovethatBP-SAshaveagreatpotentialforopticalmodulationinthemid-infraredrange.
简介:Inthispaper,weproposedawaytorealizeanEr-dopedrandomfiberlaser(RFL)withadisorderedfiberBragggrating(FBG)array,aswellastocontrolthelasingmodeoftheRFLbyheatingspecificlocationsofthedisorderedFBGarray.ThedisorderedFBGarrayperformsasboththegainmediumandrandomdistributedreflectors,whichtogetherwithatunablepointreflectorformtheRFL.Coherentmulti-moderandomlasingisobtainedwithathresholdofbetween7.5and10mWandapowerefficiencybetween23%and27%whenthereflectivityofthepointreflectorchangesfrom4%to50%.Tocontrolthelasingmodeofrandomemission,aspecificpointofthedisorderedFBGarrayisheatedsoastoshiftthewavelengthoftheFBG(s)atthispointawayfromtheotherFBGs.Thus,differentresonancecavitiesareformed,andthelasingmodecanbecontrolledbychangingthelocationoftheheatingpoint.
简介:Inthispaper,Er/Ybco-dopedfiberamplifiers(EYDFAs)withanYb-bandfiberBragggrating(FBG)atthepumpendtoimprovetheperformanceoftheamplifierissystematicallystudied.TheinfluenceofthereflectivityandcenterwavelengthoftheFBGalongwiththegain-fiberlengthontheperformanceofanEYDFAarenumericallyanalyzed.TheresultsshowthatthewavelengthoftheFBGhascriticalinfluenceontheefficiencyoftheEYDFA,whereastherequirementtoitsreflectivityisrelaxed.Itisaneffectiveandpromisingwaytoimprovetheefficiencyofahigh-powerpumpedEYDFAbyintroducingasuitableYb-bandFBGatthepumpend.Basedontheanalysisoftheunderlyingprinciples,suggestionsforthepracticaldesignandpossiblefurtherimprovementstrategiesarealsoproposed.
简介:Erbium,Ytterbium-codopedZrO2nanoparticles(ZrO2∶Er3+,Yb3+)werepreparedbythesol-emulsion-geltechnique.Thepurposeofthepresentstudyistheapplicationofupconversionphosphorinthebiologicallabel.Inordertomakeoutthemechanismofupconversionunder980nmexcitationthe488nmpumpwasused.Theinfluenceoftemperatureonthecrystallitephasewasstudied.TheresultsconfirmtheupconvertedmechanisminZrO2∶Er3+,Yb3+nanocrystalsisduetoanenergytransferupconversion(ETU).
简介:Wereportgenerationofsub-100fspulsestunablefrom1700to2100nmviaRamansolitonself-frequencyshift.Thenonlinearshiftoccursinahighlynonlinearfiber,whichispumpedbyanEr-dopedfiberlaser.Thewholesystemisfullyfiberized,withouttheuseofanyfree-spaceoptics.Thankstoitsexceptionalsimplicity,thesetupcanbeconsideredasanalternativetomode-lockedTm-andHo-dopedfiberlasers.
简介:Tuningthecoloroutputofrare-earthiondopedluminescentnanomaterialshasimportantscientificsignificanceforfurtherextendingapplicationsincolordisplays,lasersources,optoelectronicdevices,andbiolabeling.Inpreviousstudies,pre-designedphasemodulationofthefemtosecondlaserfieldhasbeenproventobeeffectiveintuningtheluminescenceofdopedrare-earthions.Owingtothecomplexlight–matterinteractionintheactualexperiment,thedynamicrangeandoptimalefficiencyforcolortuningcannotbedeterminedwiththepre-designedphasemodulation.Thisarticlesharesthedevelopmentofanadaptivefemtosecondpulseshapingmethodbasedonageneticalgorithm,anditsusetomanipulatethegreenandredluminescencetuninginanEr3+-dopedglassceramicunder800-nmfemtosecondlaserfieldexcitationforthefirsttime.ExperimentalresultsshowthattheintensityratioofthegreenandredUCluminescenceofthedopedEr3+ionscanbeeitherincreasedordecreasedconvenientlybythephase-shapedfemtosecondlaserfieldwithanoptimalfeedbackcontrol.Thephysicalcontrolmechanismsforthecolortuningarealsoexplainedindetail.Thisarticledemonstratesthepotentialapplicationsoftheadaptivefemtosecondpulseshapingtechniqueincontrollingthecoloroutputofdopedrare-earthions.