简介:Laser-inducedbreakdownspectroscopy(LIBS)isananalyticaldetectiontechniquebasedonatomicemissionspectroscopytomeasuretheelementalcomposition.LIBShasbeenextensivelystudiedanddevelopedduetothenon-contact,fastresponse,highsensitivity,real-timeandmulti-elementalde-tectionfeatures.ThedevelopmentandapplicationsofLIBStechniqueinAsiaaresummarizedanddiscussedinthisreviewpaper.TheresearchersinAsiaworkondifferentaspectsoftheLIBSstudyinfundamentals,dataprocessingandmodeling,applicationsandinstrumentations.Accordingtothecurrentresearchstatus,thechallenges,opportunitiesandfurtherdevelopmentofLIBStechniqueinAsiaarealsoevaluatedtopromoteLIBSresearchanditsapplications.
简介:我们由导致激光的故障光谱学(解放)的炸药的察觉上的最近的工作在这份报纸被考察。我们学习了器官的炸药的导致激光的血浆的物理机制,TNT。在单个光子的刺激下面的TNT的解放系列用MATLAB被模仿。碳,氢,氧,和氮对血浆温度的原子排放线紧张的变化也被模仿。我们也调查普通无机的爆炸、黑粉末的解决时间的解放系列,在二种包围气氛,表情和氩,并且发现黑色的O原子排放线SBR的最大的价值搽粉发生在596ns的门延期。我们的工作的另一个焦点在使用象原则部件分析(PCA)和部分最少的广场判别式分析(PLS-DA)那样的chemometic方法把器官的炸药与象塑料那样的器官的材料区分开来上。为分类的一个PLS-DA模型被造。TNT和塑料的七种类型被选择为样品测试模型。试验性的结果证明解放结合了chemometric技术有能力从塑料区别器官的炸药。
简介:Ultrashortlaserpulsesareusedtocreatesurfacestructuresonthin(25μm)silicon(Si)wafers.Scanningthewaferwithagalvanometricmirrorsystemcreateslargehomogeneouslystructuredareas.Thevarietyofstructureshapesthatcanbegeneratedwiththismethodisexemplifiedbytheanalysisofshape,heightanddistanceofstructurescreatedintheambientmediaairandisopropanol.Astudyofthecorrelationbetweenstructureheightandremainingwaferthicknessispresented.Thecomparativelyeasymanufacturingtechniqueandthestructurevarietythatallowsforcustom-tailoredtargetsshowgreatpotentialforhighrepetitionrateionaccelerationexperiments.
简介:Wereportsingle-shotdamagethresholdasafunctionofpulseduration(50-900fs)forMgF2/ZnS800-nmomnidirectional-reflectionfilm,interferencefilter,andgoldfilm.Theresultsindicatethatthedamagewithultrashortpulseisnonthermal,whichisdifferentfromthatwithlongpulse.Additionally,theablationcraterdepthsof45°high-reflectionfilmandinterferencefilterarepresented.Alogarithmicrelationbetweentheablationdepthandpulsefluence,whichissimilartothatoftransparentmaterials,isfound.
简介:Thelaser-inducedrelativisticshockwavesaredescribed.Theshockwavescanbecreateddirectlybyahighirradiancelaserorindirectlybyalaseraccelerationofafoilthatcollideswithasecondstaticfoil.Aspecialcaseofinterestisthecreationoflaser-inducedfusionwherethecreatedalphaparticlescreateadetonationwave.Anovelapplicationissuggestedwiththeshockwaveorthedetonationwavetoigniteapre-compressedtarget.Inparticular,thedeuterium–tritiumfusionisconsidered.Itissuggestedthatthecollisionoftwolaseracceleratedfoilsmightserveasanovelrelativisticacceleratorforbulkmaterialcollisions.
简介:Thedetailsofthespecialthree-dimensionalmicro-nanoscalerippleswithaperiodofhundredsofmicronsonthesurfacesofaZr-basedandaLa-basedmetallicglassirradiatedseparatelybysinglelaserpulseareinvestigated.Weusethesmall-amplitudecapillarywavetheorytounveiltherippleformationmechanismthroughconsideringeachofthemoltenmetallicglassesasanincompressibleviscousfluid.Ageneralizedmodelispresentedtodescribethespecialmorphology,whichfitstheexperimentalresultwell.Itisalsorevealedthattheviscositybringsaboutthebiggesteffectonthemonotonedecreasingnatureoftheamplitudeandthewavelengthofthesurfaceripples.Thegreatertheviscosityis,theshortertheamplitudeandthewavelengthare.
简介:Atheoreticalmodelisproposedtodescribethemechanismoflaser-inducedplasmashockwaveevolutioninair.Toverifythevalidityofthetheoreticalmodel,anopticalbeamdeflectiontechniqueisemployedtotracktheplasmashockwaveevolutionprocess.Thetheoreticalmodelandtheexperimentalsignalsarefoundtobeingoodagreementwitheachother.Itisshownthatthelaser-inducedplasmashockwaveundergoesformation,increaseanddecayprocesses;theincreaseandthedecayprocessesofthelaser-inducedplasmashockwaveresultfromtheoverlappingofthecompressionwaveandtherarefactionwave,respectively.Inaddition,thelaser-inducedplasmashockwavespeedandpressuredistributions,bothafunctionofdistance,arepresented.
简介:导致激光的血浆今天代表普遍分光镜的排放来源。它能容易用紧缩、可靠的毫微秒被产生材料的一个大变化上的搏动的激光。它为例如有导致激光的故障光谱学(解放)的spectrochemical分析的申请变得那么流行一个人趋于忘记导致它的产生并且管理它的进化的复杂物理、化学的过程。这篇评论文章的目的是总结必要的背景从它的产生理解并且描述导致激光的血浆到它的扩大进周围的气体。目的是不详细说明每个过程的细节;在文学为那有众多的专业化论文和书。这里的目标是在必要理解元素需要从一个复杂过程把导致激光的血浆描述为结果的一份一样的报纸聚在一起。这些元素能在背景气体在象激光事相互作用,材料的激光脱离,热、电离的气体的光、热力学的性质,或血浆繁殖那样的几块相关却独立的地里被驱散。我们相信那介绍以一条全面的路并且在这份报纸的有限的页理解导致激光的血浆的元素的整体将对进一步的开发有用并且优化LIBS技术的使用。每次如此的说明变得可能、有用,在我们的实验室获得的试验性的结果被用来说明学习物理过程。
简介:Objective:Laser-inducedCoulombexplosionofgoldnanoparticlesforbreastcancerhasbeenstudiedbynanophotolysistechnique.Thisstudyaimedtoinvestigatewhetherlaser-inducedbubbleformationduetoCoulombexplosioncanprovideaneffectiveapproachforselectivedamageofbreastcancerwithgoldnanoparticles.Method:Numericalmethodinvolveslaser-inducedCoulombexplosionofgoldnanoparticles.Differentparametersrelatedtonanophotolysissuchaslaserfluence,tumordepth,clusterradius,laserpulseduration,andbubbleformationisstudiednumerically.NumericalsimulationwasperformedusingMatlab.Results:Thegoldnanoparticlesof10,20,30,40,and50nminradiuscouldpenetrateintotumor1.14,1.155,1.189,1.20and1.22cmindepthrespectively.Themaximumpenetrationdepthintumorcouldbeobtainedwithnanoparticlesof50nmradius.Shortlaserpulseof40nswithnanoparticlesof10nmradiuscouldpenetrateintotumor1.14cmindepth.Bubbleswitharadiusof9μmcouldeffectivelykillbreastcancercellswithoutdamaginghealthyones.Thebubbleradiusincreasedfrom4to9μmwithanincreaseinpulsedurationintherangeof10to30ns.Conclusions:Goldnanoparticleswithincreasingradiusandbubbleformationforselectivedamageofbreastcancercellsaresuccessfullyprobed.Thepresentcalculatedresultsarecomparedwithotherexperimentalfindings,andgoodcorrelationisfoundbetweenthepresentworkandpreviousexperimentalvalues.Itwasdemonstratedthatbubbleformationintumormayfurtherincreasetheefficacyofbreastcancertreatment.
简介:Lens-to-sample距离,延期时间,大气的状况,激光脉搏精力,等等在导致激光的故障光谱学的分析表演上有明显的效果。在这份报纸,这些参数详细地被调查,我们将解释他们怎么在分析表演上有影响。结果证明在样品表面下面的焦点的飞机能改进精确和察觉限制,并且延期时间应该根据敏感和精确性被决定。光谱线紧张比氦,氮和空气在氩是更强壮的气体环境。脉搏精力应该超过能产生血浆的精力阀值(大约50mJ),并且精力不应该超过大约300mJ避免血浆防护。分别地在最佳参数,C的集中亲戚标准差,Si,Mn,P,S,Ni,和为被测量11次的低合金的钢(第11278期样品)的Cr下面是2.37%,2.18%,2.23%,7.8%,9.34%,1.92%,和2.13%并且为纯钢的C,Si,Mn,P,S,Ni,和Cr的察觉限制分别地是0.0045%,0.0072%,0.0069%,0.0027%,0.0024%,0.0047%,和0.0024%。
简介:Micro-depositionofanaluminumfilmof500-nmthicknessonaquartzsubstratewasdemonstratedbylaser-inducedforwardtransfer(LIFT)usingafemtosecondlaserpulse.Withthehelpofatomicforcemicroscopy(AFM)andscanningelectronmicroscopy(SEM),thedependenceofthemorphologyofdepositedaluminumfilmontheirradiatedlaserpulseenergywasinvestigated.Asthelaserfluencewasslightlyabovethethresholdfluence,thehigherpressureofplasmaforthethickerfilmmadethefreesurfaceofsolidphaseburstout,whichresultedinthatnotonlythesolidmaterialwassputteredbutalsothedepositedfilmintheliquidstatewasmadeirregularly.
简介:Asanatomicemissionspectroscopytechnique,laser-inducedbreakdownspectroscopy(LIBS),firstproposedbyBreechandCrossin1962[1],hasattractedmuchaca-demicandindustrialinterestforitsuniqueproperties.Byfocusingapulsedlaserontothesurfaceofatarget,laser-inducedplasmascanbegenerated.Thesimplicityofsamplepreparationofthelaserablationprocessen-ablesLIBStodirectlyanalyzesolid,liquid,orgaseousmaterialsintheatmosphere,makingitaconvenienttoolforchemicalanalyses.TheuniquefeaturesofLIBSsuchasrequiringlittleornosamplepreparation,allowingre-motedetection,andfacilitatingmultipleelementalanal-yseshavecontributedtoitsrapiddevelopmentinrecentyears.