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(1)

N2レーザー励起有機色素混合物系のエネルギー移動

によるレーザー発振の研究-1-装置(レーザー)およ

びローダミン6G-クレシルバイオレット色素混合系

著者

KUSUMOTO Yoshifumi, SATO Hiroyasu, MAENO

Kazuto

journal or

publication title

鹿児島大学理科報告

volume

26

page range

151-156

year

1977

別言語のタイトル

Study of Lasing by Means of Energy Transfer in

Organic Dye Mixtures Pumped by an N2 Laser. l.

Apparatus (Lasers) and Rhodamine 6G-Cresyl

Violet Dye Mixture System

(2)

By YoshihumiKusuMoTo,HiroyasuSATo,andKazutoMAENo* CノzemicaII"sが”e,CO"e9gq/L坊e7alIA7ts,Ka9oshimaU"jひe7sがy, Ko7”0t0,Kα90sノzima890 (ReceivedMay4,1977) Sci・Rep・KagoshimaUniv.,No.26,pp、151-156,Sept.,1977 Thenitrogenanddyelasersystemhasbeenconstructedandasanexampleofitsapplicationthelaser characteristicsoftherhodamine6G-cresylvioletdyemixturesystemhavebeenstudiedlthasbeen fbundthatmostofthepumppowerabsorbedbyrhodamine6GistransfbrredtocresylvioletasausefUl pumppower・Inaddition,ourlasersystemhasbeenshowntobee髄cientlypowerfUlforspectroscopic stl'rIies.

S麺dyofLzIsingbyMea風sofEnergyTransferi皿OrganicDye

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a皿dRhodaInime6G-CresyIVioletDyeMixtureSystem

*DepartmentofChemistry,FacultyofScience,KagoshimaUniversity、 151 1.XmmductiOn

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(1=337.1nm).Ingeneral,however,itisdi髄culttoobtainthee髄cientlaseremission

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(3)

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StudyofLasinginOrganicDyeMixturesPumpedbyanN2Laser 153 ロ ロ ロ 8 1 0 1 2 . 1 4 1mpressedvplta9e/kv Fig、3.Nitrogenlaserpeakpowerasa fimctionofimpressedvoltage、 Nitrogengaspressure:60Torr. 0 5 0 1 0 0 Gaspressure/Torr Fig、2.NitrogenlaserpeakpowerasafUnctionof nitrogengaspressure・Impressedvoltage: 12kV. 5 言一の匡①﹄匡一のン一一句一の正 5 0 言一の匡の]匡一のン一]両一の正 0 0.0 2.4.Che】?zjcaIs Thestructureofrhodamine6Gandthemolecularfbrmulaofcresylvioletareshown 2.2.DygLaSe7 ThetransverselypumpedconfigurationusedinthisstudyisalsoshowninFig、1.The UVoutputbeamfromthepulsednitrogenlaserwasfbcusedbyacylindricalquartzlens CL(f=10cm)onthesurfaceofthedyesolutioninasquarequartzspectroHuorometer cellC(1cm×1cm×4.5cm).Theexistenceofapulsedlaserbeamofthedyemixture wasobservedvisuallywhilethelaseremissionspectraweremeasuredbytheabove-mentionedphotoelectricrecordingsystem. wasabout3ns,Themaximumoutputwasobtainedatanitrogenpressureofca、60 Torr,asshowninFig、2..Figure3givestheoutputpeakpowerasafimctionoftheim‐ pressedvoltage,showingthelinearrelationship、Sincethelaseroutputpowercouldnot becalibrated,weusedtheimpressedvoltage(V)insteadofthecalibratedoutputpower (e、9.,kWunit)asthelasingthreshold,AIthoughtherepetitionfrequencypanbein‐ creased,thepresentexperimentiscarriedoutwiththerepetitionhequencyofcα、1Hz dUetothestabilityofthetrigger. 2.3.FI"07℃Sce"Ceα”AbSO7〆iO"MeaS”・gme"tS TheHuorescencespectrawerealsomeasuredwiththephotoelectricrecordingsystem showninFigo1・TheHuorescencewasanalysedwiththegratingmonochromator・ TheoutputofthephotomultiplierwasfbdintotheDCpreamplifierandthentothere再 corder、 ExcitationradiationwasobtainedfromanUshio500-Wsuper-high-pressuremercury arclamp,typeUSH−500D・TheexcitationlightbeamwaspassedthroughaToshiba glassnlterUV−D1A・ TheabsorptionspectraweremeasuredwithaShimadzuMPS-50Lmultipurposerecord-ingspectrophotometer・Allthemeasurementsweremadeatroomtemperature.

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3.2.肋sor”o〃α"dFI"o7・esce"ceSPec抑

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Rh-6G(Fig.5a)andCV(Fig.5b).TheabsorptioncurveswereobtainedfbralO-mm

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572and643nm,respectively・ThemolarextinctioncoeHacients(8)atthe337.1-nm excitationwavelengthofRh-6GandCVare6×103and3×103cm−1M−1,respectively・ Ithasbeenknownthattheabsorptioncrosssectionsat337,1,mare2.4×10−17cm2 fbrRh−6Gand4×10−18cm2fbrCV、5)AscanbeseeninFig、5,thesedyeshaveagood

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Rh-6GandalargeportionofthisexcitationistransfbrredtoCVinadistancesmauenough YoshihumiKusuMoTo,HiroyasuSATo,andKazutoMAENo inFig、4.Rhodamine6G(thelaser-dyegrade; Rhodqmine-6G(Rh-6G)

r鋼:::>c鱗1㎡慨鑑鯛鰯撫蝋:星

WestGermany)wereusedwithoutfilrther Cresy(violet(CV1 purification・Asfbrthesolvent,methanol wasusedasobtainedfromDQjindoLab.(the G9H8CIN30

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154 3.ResultsandDiscussio、 3.1.Crj〃iα/b7・SeIec伽9伽DC"07.−AccePm7・Sys舵m Twosolutes,oneadonor(Rh-6G)andtheotheranacceptor(CV)weredissolvedin asolvent(methanol).Here,itshouldbeemphasizedthatthisacceptorcompoundwas

employedbecauseofitshigherlasingthresholdrelativetothedonorwhenpumped

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cenceandtheacceptorabsorptionspectrum). 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 Wavelen9th/nm Fig.5.Absorption(A)andfluorescence(F)spectraofrhodamine6G(Rh-6G) andcresylviolet(CV).Absorptionpathlength:1cm・Concn.:Rh−6G, 2.0×10−8M;CV,0.9×10-8M;inmethanol・Thearrowsontheabcissa refertothe337.1-nmexcitationwavelength. 0

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Study・ofLasinginOrganicDyeMixturesPumpedbyanN2Laser 155 昏一の宮のE一の三一画一の正

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の。匡両p湾○の。く 一 _ 一∼ ア ー A A 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 Wavelen9th/nm Absorption(A)and且uorescence(F)spectraofadyemixturesolutioncontainin9 2.0×l0−3Mrhodamine6G,and0.9×10=3Mcresylvioletinmethanolも Absorptionpathlength:1cm. 0V Fig.6. togiveaneB5cientlyeBfectivepumppowerdensity・Figure6showstheabsorptionand Huorescencespectraofamixtureof2、0×10−3MRh−6GandO、9×10−3MCV、The Huorescencebandscenteredaround642and570nmareidentifiedasoriginatingfrom CVandRh-6G,respectively・AscanbeseeninFig6,inthedyemixturetheRh-6G fluorescenceisalmostcompletelysuppressedinfworofthelonger-wavelengthCV emission,indicatingane伍cientexcitationtransferfromRh−6GtoCV・Therefbre,it maybesuggestedthatCVispumpedinbothitsUVandvisibleabsorptionbandsandmost ofthefiuorescenceemissionisduetoexcitationofthevisiblebandthroughtheenergy transferfromRh−6G. 3.3.Lase7.E”ssio〃α”Las加9T h7℃shoM Figure7showsthemeasuredlaseremissionspectrumfbrasolutioncontaining2.0× 10-3MRh−6GandO、9×10−3MCVmentiOnedabove,ThelaseremiRRionbandinthis dyemixtureiscenteredatabout642nm、Thelasingthresholdwasmeasuredtobe6.4 kV・Forcomparison,thelaserspectrumfbraO、9×10−3MCV-onlysolutionwasalso measuredandisshowninFi9.8.AscanbeseeninFig、8,thelasingwavelengthinthis CV-onlysolutionisingoodagreementwiththatinthedyemixture,whilethelasing thresholdintheformerwasmeasuredtobe8、4kVandishigherthanthatinthelatter・ Alltheresultsmentionedabovesupportthatthelaseremissioninthedyemixtureorigi-natesfromCV、Therefbre,itcanbeconcludedthatmostoftheexcitationabsorbedby Rh-6GistransfbrredtoCVasausefnlpumppower,inotherwordspumpingbyexcita-tiontransfbrisquitee価cient、Here,itshouldbereferredtothatsimilarexperiments, 600650700 WaveIen9th/nm Fig.8.LasingwavelengthsofO、9×10−3M cresylvioletinmethanol. Rh-6G岩0V 6 0 0 6 5 0 7 0 0 Wavelen9th/nm Fig.7.Lasingwavelengthsofthesamedye mixturesolutionasthatinFi9.6. 昏一のこの一三①ン一﹄何一の正 ︷一一のこの︾室一①こ↑画一の正

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156 YoshihumiKusuMom,HiroyasuSATo,andKazutoMAENo usingthesametwodyes,havebeenperfbrmedearlierbyMoellereMI.4)andbyDienes andMadden、5)Ontheotherhand,Castelli'0)hasreportedstimulatedemissionofCV pumpedbyanN21aseroraRh−6Gdyelaserandhasshownthatthelasingefficiencyof CVismuchhigherfbrpumpingwithaRh-6GdyelaserthanfbrthatwithaN21aser・ Ourconclusionisingoodagreementwiththeirs,4,5,1o) InarelatedexperimentwehavealsotesteddyemixturescontainingRh−6Gasadonor and3,3'-.iethylthiacarbocyanineiodideasanacceptoratvariousconcentrations・ Theresultsobtainedwillbepresentedelsewhere、11) 4.Summary WehaVeinvestigatedthelasingcharacteristicsofRh-6G-CVmixturesbymeasure‐ mentsoftheabsorption,fluorescence,andlaseremissionspectraaswellaslasingthreshold・ ItwasshoWnthatenergytransfbrfromtheRh-6Gdonordecreasesthethresholdpump intensitythanthatneededfbrdirectexcitationoftheCVacceptor・Inaddition,itwas shownthatitispossibletostudytheenergytransfbrdyelaserwithourlasersystem becausethepumpingoutputpowerofthenitrogenlaserisefficientlypowerM. Acknowledgment TheauthorswishtothankProfessorTeiichiroOgawaandMr、Totarolmasaka,the FacultyofEngineering,KyushuUniVersity,fbrtheirguidanceintheconstructionofthe

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andSuggesti0,s・ThanksarealsoduetoMr、ShigetakaShintanifbrhiscooperation insomepartoftheconstructionofthenitrogenlaser,andtothePhysicallnstitUte, CollegeofLiberalArts,KagoshimaUniversityfbrtheuseoftheirsynchroscopeand theirkindhospitality. 1 ) 2 ) 3 ) 4 ) 5 ) 6 ) 7 ) 8 ) 9 ) 1の 11) ReferenceS D、Basting,F・P・sch雄r,andB・Steyer,Opto-eIec"0".,4,43(1972). O・Hilderbrand,OpZ.CO加加”.,10,310(1974). C・Lin,IEEEJ.@"α伽mEIec抑".,QE-11,61(1975). C・EMoeller,C,M・Verber,andA.H・Adelman,4卯1.Phys・Le〃.,18,278 (1971). A・DienesandM、Madden,』.』〃I.Phys.,44,4161(1973). 1.B・Berlman,M、Rokni,andC.R・Goldschmidt,Che柳.Phys・Leが.,22,458 (1973). S、A、Ahmed,』.G、Gergely,andD、1曲nte,J・Che腕.Phjノs,,61,1584(1974). EWeissandS・Speiser,Che、、Phys.Leが.,40,220(1976). M・MaedaandY・Miyazoe,J肌J、4〃1.Phys.,13,827(1974). F・Castelli,AppI・Phys・Le".,26,18(1975). Y・Kusumoto,H・Sato,andK・Maeno,tobepublished.

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