简介：TheeffectsofF^-ionsinagermanium-lead-telluriteglasssystemonthespectralandpotentiallaserpropertiesoftheYb^3+areinvestigated.Theabsorptionspectra,lifetimes,theemissioncross-sectionsandtheminimumpumpintensitiesoftheglasssystemwithandwithoutF^-ionshavebeenmeasuredandcalculated.TheresultsshowthatthefluorescencelifetimeandtheminimumpumpintensityofYb^3+ionsincreaseevidently,whichindicatesthatgermanium-lead-oxyfluoridetelluriteglassisapromisinglaserhostmatrixforhighpowergeneration.FT-IRspectrawereusedtoanalysetheeffectofF^-ionsonOH^-groupsinthisglasssystem.AnalysisdemonstratesthatadditionoffluorideremovestheOH^-groupsandresultsinimprovementoffluorescencelifetimeofYb^3+.

简介：韩国研究人员发现，经过精心设计的白光发光二极管有助于优化个人的生理节律。韩国国民大学JiHyeOh及其同事研究了四组白光LED，其中包括荧光粉转换型红光LED、黄橙光LED、绿光LED和蓝光LED，以及一个长波长粉色镜。他们把这些装置与各种传统形式的照明装置做比较，发现这四组LED设计的照明效率高，

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简介：为了在柴油的核心区域调查微滴尺寸的分发，喷洒，微滴尺寸的即时测量被先进激光2焦点速度计(L2F)进行。L2F的微规模的探查由二foci组成，在他们之间的距离是36μm。测试的嘴有0.2公里直径单个洞。注射压力，针电梯，和曲柄角度的大小被L2F在位置与测量同步从嘴出口的10公里downstream。比在在针下面的离开轴区域，完整的电梯调节并且微滴尺寸的空间分发改变速度集合，水花轴附近的微滴才大。在水花核心区域的微滴尺寸的概率密度分发能在大多数注射时期被适合到Nukiyama-Tanasawa分发，这被发现。

简介：Whenmeasurementsareperformedinhighspeed,small-scalecompressors,theuseofcurvedglasswindowsisrequiredinordertoavoidanymismatchbetweenthemeasurementwindowandthecasing.However,theglasscurvatureleadstoopticaldistortions,whichhinderacceptablemeasurementsandcanevenpreventtheacquisitionofanydata.Thus,anoriginalopticalassembly,whichconsistsininsertingasimpleandinexpensivecorrectivewindowbetweenthefrontallensoftheanemometerandtheshroudwindow,isproposed.Thewayofdeterminingthegeometriccharacteristicsandthepositionofthiscorrectivewindow,whichrestoresveryacceptablefoci,ispresentedinthepaper.Thereliabilityofthiscorrectiveopticalassemblyishighlightedbycomparativemeasurementsinatestcase.Usingsuchanopticalsetting,L2Fmeasurementswererealisedalongasection,downstreamoftheinletguidevane(IGV)ofatransoniccompressorstage.Thespatialresolutionleadstoagooddescriptionoftheinteractionofthewakewiththeobliqueshockemanatingfromtheleadingedgeoftherotor.Aphenomenologicalstudyofthewake/shockinteractionwithachangeofframeisrealisedusingthestreamwiseequationofthetransportofvorticity.

简介：TypeIX-rayburstsarethemostfrequentthermonuclearexplosionsinnature,resultingfromthermonuclearrunawayonthesurfaceofanaccretingneutronstar[1].Thebreakoutreaction14O(α,p)17FfromthehotCNOcyclemayhaveaprominentimpactontheburstlightcurveandburstashes[2].However,insufficientexperimentalinformationisavailabletocalculateareliable,preciserateforthisreaction[3].Weproposedtoaddresstheexperimentalinvestigationofthe14O(α,p)17FusingTimeProjectionChamber(TPC)[4].

简介：首次制备出粉末微晶BaCl0.5Br0.5F:Sm2+红色发光材料,并测量了其低温光谱。发现其谱线宽度与BaClF:Sm2+的相比较有了约十倍左右的非均匀增宽,而且相应于5D0,1,2→7F0,1的谱线由两个峰间距分别为15cm-1,65cm-1的谱线构成,峰间距只与基态7F0和7F1有关。W.Lenth&W.E.Morener[1]讨论了光子门光谱烧孔作为频率微区光学记录的理论和应用的可能性。对于长存的光谱烧孔,可以进行二进制的数据存储与改写。该技术为实现大容量、高速度的光学计算机的应用提供了新的前景。在这方面已经有了不少的研究工作[2～6]。为提高存储容量,需使光谱线非均匀增宽,以提供更多的光谱烧孔可能性。为此目的,首次制备出粉末微晶BaCl0.5Br0.5F:Sm2+红色发光材料,并测量了其低温光谱,并将其与BaClF:Sm2+的低温光谱进行了比较分析。

简介：Ultrafastfiberlasersareingreatdemandforvariousapplications,suchasopticalcommunication,spectroscopy,biomedicaldiagnosis,andindustrialfabrication.Here,wereportthehighlystablefemtosecondpulsegenerationfromaMXenemode-lockedfiberlaser.Wehavepreparedthehigh-qualityTi3C2Txnanosheetsviatheetchingmethod,andcharacterizedtheirultrafastdynamicsandbroadbandnonlinearopticalresponses.Theobviousintensity-andwavelength-dependentnonlinearresponseshavebeenobservedandinvestigated.Inaddition,ahighlystablefemtosecondfiberlaserwithsignal-to-noiseratioupto70.7dBandcentralwavelengthof1567.3nmhasbeendelivered.Thestudymayprovidesomevaluabledesignguidelinesforthedevelopmentofultrafast,broadbandnonlinearopticalmodulators,andopennewavenuestowardadvancedphotonicdevicesbasedonMXenes.

简介：2013年12月，美国国家仪器有限公司（NationalInstru—ments，简称NI）发布了NICVS-1457RT视觉系统产品。该产品坚固紧凑，