简介:Erbium,Ytterbium-codopedZrO2nanoparticles(ZrO2∶Er3+,Yb3+)werepreparedbythesol-emulsion-geltechnique.Thepurposeofthepresentstudyistheapplicationofupconversionphosphorinthebiologicallabel.Inordertomakeoutthemechanismofupconversionunder980nmexcitationthe488nmpumpwasused.Theinfluenceoftemperatureonthecrystallitephasewasstudied.TheresultsconfirmtheupconvertedmechanisminZrO2∶Er3+,Yb3+nanocrystalsisduetoanenergytransferupconversion(ETU).
简介:CaF2:Ho3+/Yb3+nano-particleswithintensegreenup-conversion(UC)luminescencearesuccessfullysynthesizedviaafacilehydrothermalapproachbyusingNH4FasthefluoridesourceandNa2EDTAasachelatingreagent.PowderXraydiffraction(XRD),transmissionelectronmicroscopy(TEM),fieldemissionscanningelectronmicroscopy(FE-SEM),andUCemissionspectraareusedtocharacterizethestructures,shapes,andluminescentpropertiesofthesamples.TheeffectsfromfluoridesourcesandchelatingreagentsontheformationsofCaF2nano-particlesareinvestigated,andtheformationprocessisalsodeduced.Undertheexcitationofa980-nmlaserdiode,thesampleseachshowagreenup-conversionemissioncenteredat540nmcorrespondingtothe5S2/5F4→5I8transitionsofHo3+.Moreover,theUCmechanismsofHo3+/Yb3+co-dopedCaF2nano-particlesarealsodiscussed.
简介:ThestimulatedBrillouinscattering(SBS)thresholdenhancementfactorinapurewhitenoiselinewidthbroadeningYb-dopedfiberamplifier(YDFA)withashortlargemodeareafiberistheoreticallyandexperimentallystudied.Wedemonstratea1064.08nm,11.6GHzlinewidth,1.5kWoutputpowerYDFAwithanSBSthresholdenhancementof~57(26WSBSthresholdwithsinglefrequencyseed).Theoutputbeamisnear-diffractionlimitedwithabeamqualityfactorofM~2=1.15andaslopeefficiencyofupto87%.NoSBSorstimulatedRamanscatteringeffectsareobservedinthewholepowerrange.Furtherpowerscalingislimitedbytheavailablepumppowerinoursystem.
简介:有高精力的波长悦耳的超短波的脉搏来源高度为很多应用被需要。波长悦耳的all-normal-dispersion(ANDi)锁模式的纤维激光,能容易被压缩并且由所有纤维结构放大了,是有紧缩的结构的如此的来源的一粒有希望的种子。在不同中心波长的脉搏压缩和扩大(从1026~1058nm)悦耳的ANDiYbdoped锁模式的纤维,我们以前建议了的激光试验性地在这个工作被调查。它被发现那,为不同波长,持续时间并且从振荡器直接产量脉搏啁啾然而,更加变化压缩脉搏的持续时间少些波动。为扩大过程,由于做Yb的纤维的unflat获得光谱,在短波长的获得在长波长比那大。因而,扩大过程导致的光谱失真的趋势为不同波长是不同的。这些结果和分析将基于一粒ANDi种子对高精力、波长悦耳的超短波的脉搏来源的设计有用。
简介:Weproposeageneralmethodologytodefinetheoptimumdopingionvolumedistributionrequiredforanefficientsolid-statelaseramplifier.ThisapproachisillustratedinthecontextoftwoexperimentaldiodepumpedYb:YAGamplifiersoperatingat300and160K.Processingofsuchtailoredgainmediaisnowpossiblethroughhorizontaldirectcrystallization.
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简介:Inthispaper,wereportedamultiwavelengthpassivelyQ-switchedYb3+:GdAl3(BO3)4solid-statelaserwithtopologicalinsulatorBi2Te3asasaturableabsorber(SA)forthefirsttime,tothebestofourknowledge.Bi2Te3nanosheetswerepreparedbythefacilesolvothermalmethod.TheinfluenceofthreeBi2Te3densitiesonthelaseroperationwascompared.Themaximumaverageoutputpowerwasupto57mWwithapulseenergyof511.7nJ.Theshortestpulsewidthwasmeasuredtobe370nswith110kHzpulserepetitionrateand40mWaveragepower.Thelaseroperatedatthreewavelengthssimultaneouslyat1043.7,1045.3,and1046.2nm,ofwhichthefrequencydifferenceswerewithintheterahertzwaveband.OurworksuggeststhatsolvothermalsynthesizedBi2Te3isapromisingSAforsimultaneouslymultiwavelengthlaseroperation.