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uedbet官网手机版BBOCrystal

时间:2020-05-18作者:uedbet官网手机版已浏览: 64次

CASTECH'sBBOisfeaturedby:•Broadphasematchablerangefrom409.6nmto3500nm;•Widetransmissionregionfrom190nmto3500nm;•Largeeffectivesecond-harmonic-generation(SHG)coefficientabout6timesgreaterthanthatofKDPcrystal;•Highdamagethreshold;•Highopticalhomogeneitywithδn≈10-6/cm;•Widetemperature-bandwidthofabout55℃.

uedbet官网手机版CASTECHoffers:•Strictqualitycontrol;•Crystallengthfrom0.005mmto25mmandsizeupto15x15x15mm3;•P-coatings,AR-coatings,mountsandre-polishingservices;•Alargequantityofcrystalsinstock;•Fastdelivery(10daysforpolishedonly,15daysforAR-coated).

BBOisanegativeuniaxialcrystal,withordinaryrefractiveindex(no)largerthanextraordinaryrefractiveindex(ne).BothtypeIandtypeIIphasematchingcanbereachedbyangletuning.ThephasematchinganglesoffrequencydoublingareshowninFig.2.

ApplicationinNd:YAGLasers:BBOisanefficientNLOcrystalforthesecond,thirdandfourthharmonicgenerationofNd:YAGlasers,andthebestNLOcrystalforthefifthharmonicgenerationat213nm.Conversionefficienciesofmorethan70%forSHG,60%forTHGand50%for4HG,and200mWoutputat213nm(5HG)havebeenobtained,respectively.BBOisalsoanefficientcrystalfortheintracavitySHGofhighpowerNd:YAGlasers.FortheintracavitySHGofanacousto-opticQ-switchedNd:YAGlaser,morethan15Waveragepowerat532nmwasgeneratedinaCASTECHAR-coatedBBOcrystal.Whenitispumpedbythe600mWSHGoutputofamode-lockedNd:YLFlaser,66mWoutputat263nmwasproducedfromaBrewster-angle-cutBBOinanexternalenhancedresonantcavity.Becauseofasmallacceptanceangleandlargewalk-off,goodlaserbeamquality(smalldivergence,goodmodecondition,etc.)isthekeyforBBOtoobtainhighconversionefficiency.TightlyfocusingoflaserbeamisnotrecommendedbyCASTECH'sengineers.

ApplicationsinTunableLasers:1.DyelasersEfficientUVoutput(205nm-310nm)withaSHGefficiencyofover10%atwavelengthof≥206nmwasobtainedintypeIBBO,and36%conversionefficiencywasachievedforaXeCl-laserpumpedDyelaserwithpower150KWwhichisabout4-6timeshigherthanthatinADP.TheshortestSHGwavelengthof204.97nmwithefficiencyofabout1%hasbeengenerated.CASTECH'sBBOiswidelyusedintheDyelasers.WithtypeIsum-frequencyof780-950nmand248.5nm(SHGoutputof495nmdyelaser)inBBO,theshortestUVoutputsrangingfrom188.9nmto197nmandthepulseenergyof95mJat193nmand8mJat189nmhavebeenobtained,respectively.2.UltrafastPulseLaser

Frequency-doublingand-triplingofultrashort-pulselasersaretheapplicationsinwhichBBOshowssuperiorpropertiestoKDPandADPcrystals.Now,CASTECHcanprovideasthinas0.005mmBBOforthispurpose.Alaserpulseasshortas10fscanbeefficientlyfrequency-doubledwithathinBBO,intermsofbothphase-velocityandgroup-velocitymatching.3.Ti:SapphireandAlexandritelasersUVoutputintheregion360nm-390nmwithpulseenergyof105mJ(31%SHGefficiency)at378nm,andoutputintheregion244nm-259nmwith7.5mJ(24%mixingefficiency)havebeenobtainedfortypeISHGandTHGofanAlexandritelaserinBBOcrystal.

Morethan50%ofSHGconversionefficiencyinaTi:Sapphirelaserhasbeenobtained.HighconversionefficiencieshavebeenalsoobtainedfortheTHGandFHGofTi:Sapphirelasers.4.ArgonIonandCopper-VaporlasersByemployingtheintracavityfrequency-doublingtechniqueinanArgonIonlaserwithalllinesoutputpowerof2W,maximum33mWat250.4nmandthirty-sixlinesofdeepUVwavelengthsrangingfrom228.9nmto257.2nmweregeneratedinaBrewster-angle-cutBBOcrystal.Upto230mWaveragepowerintheUVat255.3nmwithmaximum8.9%conversionefficiencywasachievedfortheSHGofaCopper-Vaporlaserat510.6nm.BBO'sOPOandOPA:

TheOPOandOPAofBBOarepowerfultoolsforgeneratingawidelytunablecoherentradiationfromtheUVtoIR.ThetuninganglesoftypeIandtypeIIBBOOPOandOPAhavebeencalculated,withtheresultsshowninFig.3andFig.4,respectively.

1.OPOpumpedat532nmAnOPOoutputrangingfrom680nmto2400nmwiththepeakpowerof1.6MWandupto30%energyconversionefficiencywasobtainedina7.2mmlongtypeIBBO.Theinputpumpenergywas40mJat532nmwithpulse-width75ps.Withalongercrystal,higherconversionefficiencyisexpected.

InthecaseofNd:YAGpumping,BBO'sOPOscangeneratemorethan100mJ,withwavelengthtunablefrom400nmto2000nm.UsingCASTECH'sBBOcrystal,theOPOsystemcoversatuningrangefrom400nmto3100nmwhichguaranteesamaximumof30%andmorethan18%conversionefficiency,overthewavelengthrangefrom430nmto2000nm.TypeIIBBOcanbeusedtodecreaselinewidthnearthedegeneratepoints.Alinewidthasnarrowas0.05nmandusableconversionefficiencyof12%wereobtained.However,alonger(15mm)BBOshouldnormallybeusedtodecreasetheoscillationthresholdwhenemployingthetypeIIphase-matchingscheme.PumpingwithapicosecondNd:YAGat355nm,anarrow-band(<0.3nm),highenergy(200μJ)andwidetunable(400nmto2000nm)pulsehasbeenproducedbyBBO'sOPAs.ThisOPAcanreachashighasmorethan50%conversionefficiency,andthereforeissuperiortocommonDyelasersinmanyrespects,includingefficiency,tunablerange,maintenance,andeasinessindesignandoperation.Furthermore,coherentradiationfrom205nmto3500nmcanbealsogeneratedbyBBO'sOPOorOPAplusaBBOforSHG.

AtunableOPOwithsignalwavelengthsbetween422nmand477nmhasbeengeneratedbyangletuninginatypeⅠBBOcrystalpumpedwithaXeClexcimerlaserat308nm.AndaBBO'sOPOpumpedbythefourthharmonicofaNd:YAGlaser(at266nm)hasbeenobservedtocoverthewholerangeofoutputwavelengths330nm-1370nm.

Whenpumpedbya1mJ,80fsDyelaserat615nm,theOPAwithtwoBBOcrystalsyieldsmorethan50μJ(maximum130μJ),<200fsultrashortpulse,over800nm-2000nm.

BBOcanalsobeusedforE-Oapplications.IthaswidetransmissionrangefromUVtoabout3500nm.AndithasmuchhigherdamagethresholdthanKD*PorLiNbO3.Morethan80Woutputpowerand50KHzrepititionratehavebeenreachedbyusingCASTECH'sE-OBBOcrystalsandNd:YVO4crystalsasgainmedia.At5KHz,itspulsehaswidthasshortas6.4ns,andenergyof5.7mJorpeakpowerof900KW.IthasadvantagesoverthecommercialA-OQ-switchedone,includingaveryshortpulse,highbeamqualityandsizecompactaswell.Althoughithasarelativesmallelectro-opticcoefficient,anditshalf-wavevoltageishigh(7KVat1064nm,3x3x20mm3),longandthinBBOcanreducethevoltagerequirements.CASTECHnowcansupply25mmlongand1mmthinhighopticalqualityofBBOcrystalwithZ-cut,AR-coatedandGold/Chromeplatedonthesidefaces.

CASTECH'sWarrantyonBBOSpecifications:•Dimensiontolerance:(W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm)(L≥2.5mm)(W±0.1mm)x(H±0.1mm)x(L+0.1/-0.1mm)(L<2.5mm)•Clearaperture:central90%ofthediameter•Novisiblescatteringpathsorcenterswheninspectedbya50mWgreenlaser•Flatness:lessthanλ/8@633nm•Transmittingwavefrontdistortion:lessthanλ/8@633nm•Chamfer:≤0.2mmx45°•Chip:≤0.1mm•Scratch/Digcode:betterthan10/5toMIL-PRF-13830B•Parallelism:≤20arcseconds•Perpendicularity:≤5arcminutes•Angletolerance:≤0.25•Damagethreshold[GW/cm2]:1for1064nm,TEM00,10ns,10HZ(polishedonly)0.5for1064nm,TEM00,10ns,10HZ(AR-coated)0.3for532nm,TEM00,10ns,10HZ(AR-coated)•QualityWarrantyPeriod:oneyearunderproperuse.Note:•BBOhasalowsusceptibilitytothemoisture.UsersareadvisedtoprovidedryconditionsforbothapplicationandpreservationofBBO.•BBOisrelativelysoftandthereforerequiresprecautionstoprotectitspolishedsurfaces.•Whenangleadjustingisnecessary,pleasekeepinmindthattheacceptanceangleofBBOissmall.•CASTECHengineerscanselectanddesignthebestcrystal,basedonthemainparametersofyourlaser,suchasenergyperpulse,pulsewidthandrepetitionrateforapulsedlaser,powerforacwlaser,laserbeamdiameter,modecondition,divergence,wavelengthtuningrange,etc.•Forthincrystals,CASTECHcanprovidefreeholdersforyou.



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