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1、REPORTSprimarilytheresultofahigherthresholdforReferencesandNoteslaserpulse.Thesum-frequencysignalgeneratedinfilmopticaldamageatlowtemperature.Higher1.D.MehusandD.Evans,LaserFocusWorld31,117thecrystalisproportionaltoaninstantPLintensity(1995).atthemomentdeÞnedbyanarrivaltimeoft
2、hefilmstabilityatlowtemperatureslikelyex-gatingpulse.Byscanningthegatingpulsewithre-2.A.Strass,LaserFocusWorld30,79(1994).plainsthefactthat,althoughweobservedgain3.Y.ArakawaandH.Sakaki,Appl.Phys.Lett.40,939specttothePLpulseanddetectingthechangesintheatbothroomandcryogenictempe
3、ratures,the(1982).sum-frequencysignal,onecanobtaininformationaboutthePLtemporalproÞle.clearsignaturesofstimulatedemissionwere4.M.Asada,Y.Miyamoto,Y.Suematsu,IEEEJ.QuantumElectron.QE-22,1915(1986).24.UnlessspeciÞcallymentioned,thedatashownintheonlydetectedattemperatureT580K.Fig
4、urepaperweretakenatroomtemperature.5.Al.L.EfrosandA.L.Efros,Sov.Phys.Semicond.16,4showsexamplesofstimulatedemissionspec-772(1982).25.V.I.Klimov,Ch.J.Schwarz,D.W.McBranch,C.A.traforclose-packedfilmsofTOPO-capped6.L.Brus,J.Chem.Phys.79,5566(1983).Leatherdale,M.G.Bawendi,Phys.Rev
5、.B60,R21777.N.N.Lebedsonetal.,Semiconductors28,832(1994).(1999).QDswithR52.1nm(Fig.4A)andZnS-26.TheQDswereinitiallysizeselectedandthoroughly8.N.Kistaedteretal.,Electron.Lett.30,1416(1994).cappedQDswithR51.35nm(Fig.4B),9.M.Grundman,PhysicaE5,167(2000).washedbysequentialprecipit
6、ationsfrombutanol,recordedatprogressivelyhigherpumplevels.10.C.B.Murray,D.J.Norris,M.G.Bawendi,J.Am.Chem.usingmethanolasthenonsolvent.QDsolidswereThefilmsareopticallypumpedperpendicularSoc.115,8706(1993).thenpreparedbydropcastingÞlmsfromhexane/11.C.B.Murray,C.R.Kagan,M.G.Bawen
7、di,Science270,octanesolutions;solventevaporationyieldeddrytothesampleplane,andthestimulatedemis-1335(1995).solidÞlms.ThesolutionswereÞlteredimmediatelysionisdetectedattheedgeofthefilmsthatact12.M.Nirmaletal.,Phys.Rev.Lett.75,3728(1995).beforeÞlmdepositiontolimitaggregateformat
8、ionasopticalwaveguides.Thedevelopmentofa13.D.J.Norris,Al.L.Ef
