简介：AcompositetransparentYAG/Yb:YAG/YAGceramicwaspreparedbyanon-aqueoustape-castingmethod.Anopticaltransmittanceof82%wasobtainedatvisiblewavelengthandaround1100nm.Alow-threshold,broadbandtunablecontinuous-wave(CW)laserat1031nmwasfurtherdemonstratedfromtheceramicsample,whichwaspumpedbya974nmfiber-pigtailedlaserdiode.Thethresholdpumppowerwas0.45Wandthemaximumoutputpowerwas3.2W,correspondingtoaslopeefficiencyof20.4%.ByinsertinganSF57prisminthelasercavity,theoutputwavelengthcouldbetunedcontinuouslyfrom1021to1058nm.

简介：l、关键技术参数或产品性能YAG透明陶瓷材料采用强场熔铸制造的工艺技术制备而成。产品性能：0380×3～8mm，透明YAG陶瓷样品在可见光波段的透过率≥75％。2、功能及主要应用情况激光透明陶瓷是国际材料界研发的热点领域，在我国，这类材料主要应用于国家重大需求，即激光聚变点火工程和透明陶瓷装甲、大飞机工程、以及航天工程等。

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简介：目的：观察倍频Nd：YAG激光联合YAG激光行周边虹膜切除术治疗急性闭角型青光眼的疗效及并发症。方法：本组共105例，其中临床前期91眼，先兆期32眼，间歇期46眼，均先使用倍频Nd：YAG激光在拟行周边虹膜切孔处分层射击，最后用YAG激光穿透造孔，随访12mo，观察疗效及并发症。结果：术后1～6h眼压暂时性升高，24h后眼压下降，虹膜周切孔均通畅，房角无粘连，3眼周切孔处局限性晶状体混浊。结论：倍频Nd：YAG激光联合YAC激光行周边虹膜切除术是防止闭角型青光眼急性发作的安全有效的手术。

简介：TransparentYAG(yttriumaluminumgarnet)ceramicswerefabricatedbysolid-statereactionmethod.Effectofadditive(tetraethylorthosilicate,TEOS)onmicrostructureofYAGceramicswasinvestigated.IftheadditionofTEOSismorethan3%(massfraction),largeamountofliquidphasecanbeyieldedatgrainboundaries,resultingintheformationofsecondphaseparticlesatgrainboundaries.Iftheadditionislessthan0.05%(massfraction),poresareentrappedinthegrains.Thesuitableamountis0.5%(massfraction).AfullytransparentYAGceramicwasfabricatedbyvacuumsinteringat1700℃for5h.OpticaltransmittanceoftheYAGceramicis63%inthevisiblelightwavelengthsand70%intheinfraredwavelengths.

简介：YAGlaserweldingwithsurfaceactivatingfluxhasbeeninvestigated,andtheinfluencingfactorsandmechanismarediscussed.TheresultsshowthatbothsurfaceactivatingfluxandsurfaceactiveelementShavefantasticeffectsontheYAGlaserweldshape,thatistoobviouslyincreasetheweldpenetrationandD/Wratioinvariousweldingconditions.Themechanismisthoughttobethechangeofweldpoolsurfacetensiontemperaturecoefficient,thus,thechangeoffluidflowpatterninweldpoolduetotheflux.

简介：Anewthulium-dopedyttrium-aluminium-garnet(YAG)crystalwithvariedconcentrationsofTmwasgrownbyAnhuiInstituteofOpticsandFineMechan-ics,AcademiaSinica.Owingtoitssuperadvantagesofawiderangeoffrequenciesandhighefficience,thegarnetisconsideredtobeaneffectivetunableinfraredlasercrystalandmeetstherequirementsofcoherent

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简介：Yttriumaluminumgarnet(YAG)transparentceramicswerefabricatedbysinteringatoxygenatmosphere.Tetraethylorthosilicate(TEOS)wasaddedasthesinteringadditivetocontrolthegraingrowthanddensification.Poreswereeliminatedclearlyattemperaturelowerthan1700oC,whilegrainsizewasaround3μm.Thein-linetransmittancewas80%at1064nmwhensamplesweresinteredat1710oC.TheeffectofTEOSwasstudiedinoxygenatmospheresinteringforNd:YAGtransparentceramics.Athighertemperaturelike1710oC,thegraingrowthmechanismwassolutedrag,whileat1630and1550oCthegraingrowthwascontrolledbyliquidphasesinteringmechanism.And0.5wt.%TEOSwasthebestaddingcontentforNd:YAGsinteredinoxygenatmosphere.

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简介：AIM:Toinvestigatetheeffectsofanewopeningpatterninneodymium:yttrium-aluminum-garnet(Nd:YAG)laserposteriorcapsulotomyonvisualfunction.METHODS:Thistechniquewasconductedalongacircularpattern.Theenergyrangedbetween0.8and1.2mJ/pulsewasconsumedandmeantotalenergylevelswere74±21mJ(mean±standarddeviation:SD,from40to167)andlasershotsaimedat150μmawaybehindadatumpointandwentalonganimaginarylinewhichextends0.5mminsidefromopticmarginandintothecircularenblocpattern.Vitreousstandswereattachedwithfragmentandthentheywerecutoffbythelaseraftercircularapplication.Thecircularfragmentwascompletelyseparatedfromvitreous,andthenthisfragmentwasquicklysunkinintravitrealspace.RESULTS:Thefollow-upperiodrangesfromatleastaweekto40mo,making15.8moonaverage.Theproceduraloutcomeshowed96%(74eyesoutofthe77eyes)enhancementinpatients’visualacuity.Cystoidmacularedemaorretinaldetachmentwasnotobservedinanyofthepatientsduringfollow-upperiods.CONCLUSION:Thisnewtechniqueisexpectedtoimprovetheweaknessesthattheconventionalprocedureshavebyaddingtheprocesstocutoffvitreousstandsattachedwiththefragmentbythelasertothecircularapplication.

简介：摘要目的探讨后发性白内障YAG激光不同治疗方法的比较。方法20例（20眼）后发性白内障患者随机分为两组十字切开组和Q型切开组，术后两组从视力，角膜内皮计数，激光能量，人工晶体损伤方面进行比较。结果Q型切开组术后视力提高明显优于十字切开组，Q型切开组所用能量显著小于十字切开组（P＜0.01），Q型切开组内皮损伤弱于十字切开组（P＜0.05），Q型切开组人工晶体损伤率1/6低于十字切开组3/8。结论YAG激光Q型切开法治疗后发性白内障明显优于十字切开法。

简介：首先叙述了光纤传输Nd3+:YAG激光的优点,接着分析了不同光纤和其传输Nd3+:YAG激光的特点.然后通过对光纤传输系统各部分的分析与设计,结合实际,设计了光纤耦合机构.最后,对来自于工件反射光问题提出了解决方案.

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简介：Aneodymiumdopedyttriumaluminumgarnet(Nd:YAG)transparentceramicwasfabricatedbyasolidstatereactionmethodusingcommercialα-Al2O3,Y2O3,andNd2O3powdersasstartingmaterialsandtetraethylorthosilicate(TEOS)assinteringaid.ThemorphologyandmicrostructureofthenanopowdersandtheNd:YAGtransparentceramicwereinvestigated.ThefullydenseNd:YAGceramicwithanaveragegrainsizeof～20μmwasobtainedbyvacuumsinteringat1720°Cfor12h.Fewporesandgrain-boundaryphaseswereobserved.Thein-linetransmittanceoftheceramicwas81.5%at1064nm.

简介：Fortheestablishmentofdirectrevascularicationoftheischemicmyocardium,aNd:YAGlaserwithawavelengthof1060nmandanopiticfiberdiameterof500umwasusedtocreate20to25transmuralchannelsinthecentralischemicregionoftheleftventricleafterthecoronarywasligatured.Thechannelswerecreatedfromtheepicard1alsurfacetotheendocardiumandeachchannelreceivedabout64joulesofthe

简介：Wereportonthedesign,realization,andoutputperformanceofadiode-pumpedhigh-peak-powerpassivelyQ-switchedNd:YAG∕Cr4+:YAGcompositemediummonolithiclaserwithfour-beamoutput.Theenergyofalaserpulsewashigherthan3mJwithdurationof0.9ns.Theproposedsystemhastheabilitytochooseindependentlythefocusofeachbeam.Suchalaserdevicecanbeusedformultipointignitionofanautomobilegasolineengine,butcouldalsobeofinterestforignitioninspacepropulsionorinturbulentconditionsspecifictoaeronautics.

简介：用YAG雷射表面处理技术在硅芯片上制备微流道,并分析频率、电流强度及扫描速度对于微流道宽度、深度、热影响区及表面粗糙度之影响。实验结果显示：光斑大小随着频率的增加而减少,但却随着电流强度的增加而增加;微流道宽度则直接决定于光斑之大小;微流道深度及表面粗糙度皆受到频率、电流强度及扫描速度三种制程参数影响;而微流道热影响区在各制程参数下,其影响的变化差异并不明显。研究中当扫描速度10mm/s、电度10A及频率1KHz为最佳制程参数。

简介：AstablewavelengthoperationHo:YAGlaserdual-pumpedbytwoorthogonallypolarizedTm:YLFlasersisreported.Underthecwoperationmode,alaseroutputpowerof24Wismeasured.Thecorrespondingopticalopticalconversionefficiencyis44.75%andtheslopeefficiencyis50.12%.UndertheQ-switchedoperationmode,theoutputmaximumaveragepoweris22.8Watthere-frequencyof6kHz.Thecorrespondingoptical-opticalconversionefficiencyandslopeefficiencyare42.64%and48.01%,respectively.Theoutputcentralwavelengthis2090.73nm,thelinewidthis0.40nm,andthebeamqualityisM~2<1.6.Moreover,theshiftoftheoutputcentralwavelengthislessthan0.01nm,andthelinewidthshiftisalsolessthan0.01nm.

简介：<正>常年性鼻炎包括常年性变应性鼻炎和常年性非变应性鼻炎。我科自1994年以来应用Nd:YAG激光治疗常年性鼻炎94例,疗效比较满意,现将有随访资料的70例患者总结如下。