简介：

简介：有高精力的波长悦耳的超短波的脉搏来源高度为很多应用被需要。波长悦耳的all-normal-dispersion(ANDi)锁模式的纤维激光，能容易被压缩并且由所有纤维结构放大了，是有紧缩的结构的如此的来源的一粒有希望的种子。在不同中心波长的脉搏压缩和扩大(从1026～1058nm)悦耳的ANDiYbdoped锁模式的纤维，我们以前建议了的激光试验性地在这个工作被调查。它被发现那，为不同波长，持续时间并且从振荡器直接产量脉搏啁啾然而，更加变化压缩脉搏的持续时间少些波动。为扩大过程，由于做Yb的纤维的unflat获得光谱，在短波长的获得在长波长比那大。因而，扩大过程导致的光谱失真的趋势为不同波长是不同的。这些结果和分析将基于一粒ANDi种子对高精力、波长悦耳的超短波的脉搏来源的设计有用。

简介：

简介：Wepresentanovelandsimplemethodtoobtainanultrawidefreespectralrange(FSR)siliconringresonatortogetherwithatuningrangecoveringtheentirespectrumfrom1500to1600nm.AringresonatorwithalargeFSRtogetherwithahighQfactor,hightuningefficiency,andlowfabricationcostandcomplexityisdesiredformanyapplications.Inthispaper,weintroduceanovelwaytomakesucharingresonator,whichtakesadvantageofthewell-knownresonance-splittingphenomenon.ItisasingleringresonatorwithanFSRofmorethan150nmaround1550nmandwhichhasaneasythermo-optictunabilitythatcanproduceatuningrangearound90nmorevenmore.Moreover,thedeviceissimpletoimplementandcanbefabricatedinstandardcomplementarymetal-oxidesemiconductortechnologywithoutrequiringanykindofcomplicatedprocessingorextramaterials.Thepotentialapplicationsincludesinglemodelasercavities,wavelengthdivisionmultiplexingfilters,(de)multiplexers,opticalsensors,andintegratedreflectors.

简介：Wedemonstrateanintegratedall-fibermid-infrared（mid-IR）supercontinuum（SC）sourcegeneratedbya1.95μmmasteroscillatorpoweramplifiersystemandasingle-modeZBLAN（ZrF4–BaF2–LaF3–AlF3–NaF）fiber.Themaximumaverageoutputpoweris10.67Wwithspectralbandwidthcoveringfrom～1.9to4.1μm.Thesingle-modeZBLANfiberandsilicafiberarethermal-splicedtoenhancetherobustnessandpracticabilityofthesystem.Itis,tothebestofourknowledge,thefirsthigh-powerintegratedcompactedall-fibermid-IRSCsourcebasedonthermal-splicedsilicafiberandZBLANfiber.

简介：WedemonstrateastableconventionalsolitoninaTm-dopedhybridmode-lockedfiberlaserbyemployingahomemadeall-fiberLyotfilter(AFLF)andasingle-wallcarbonnanotube.TheAFLF,designedbysandwichingapieceofpolarization-maintainedfiber(PMF)withtwo45°tiltedfibergratingsinscribedbyaUVlaserinPMFwithaphase-maskscanningtechnique,showslargefilterdepthof~9dBandsmallinsertionlossof~0.8dB.ByoptimizingthefreespectralrangeoftheAFLF,theKellysidebandsofaconventionalsolitoncenteredat1966.4nmcanbedramaticallysuppressedwithoutimpairingthemainshapeofthesolitonspectrum.Itgivesthepulsedurationof1.18psandbandwidthof3.8nm.ByadjustingthetemperatureofthePMFoftheAFLFfrom7°Cto60°C,wavelengthtunablesolitonpulsesrangingfrom1971.62nmto1952.63nmarealsoobtained.Thegeneratedsolitonpulsescanbepreciselytunedbetween1971.62nmand1952.63nmbycontrollingthetemperatureoftheAFLF.

简介：Byusingtheultrasound-assistedliquidphaseexfoliationmethod,Bi2Te3nanosheetsaresynthesizedanddepositedontoaquartzplatetoformakindofsaturableabsorber（SA）,inwhichnonlinearabsorptionpropertiesaround2μmareanalyzedwithahome-mademode-lockedlaser.Withtheas-preparedBi2Te3SAemployed,astablepassivelyQ-switchedall-solid-state2μmlaserissuccessfullyrealized.Q-switchedpulseswithamaximumaverageoutputpowerof2.03Waregeneratedunderanoutputcouplingof5%,correspondingtothemaximumsingle-pulseenergyof18.4μJandpeakpowerof23W.Thedeliveredshortestpulsedurationandmaximumrepetitionrateare620nsand118kHzunderanoutputcouplingof2%,respectively.ItisthefirstpresentationofsuchBi2Te3SAemployedinasolid-stateQ-switchedcrystallinelaserat2μm,tothebestofourknowledge.Incomparisonwithother2Dmaterialssuitableforpulsed2μmlasers,thesaturableabsorptionperformanceofBi2Te3SAisprovedtobepromisingingeneratinghighpowerandhigh-repetition-rate2μmlaserpulses.

简介：在旅行波浪转变下面，一些非线性的部分微分方程例如Camassa河边肥沃的低地方程，高顺序的KdV方程，等等，被归结为u″表示的一首integrable颂诗+p(u)(u')2+q(u)=0答案能被给其将军。而且，为多项式联合完全的辨别系统，这些方程的所有单个旅行波浪答案的分类被获得。方程u″0包括的+p(u)(u')2+q(u)=是的方程(u')2=f(u)一种特殊情况，建议方法能也因此被用于很多非线性的方程。这些完全的结果不能被任何间接方法获得。

简介：

简介：Thesuppressionoftherecombinationofelectronsandholes(e–h)andtheenhancementofthelightabsorptionofsemiconductorsaretwokeypointstowardefficientphotocatalyticdegradation.Here,wereportafew-layerg-C3N4/α-MoO3nanoneedles(flg-C3N4/α-MoO3NNs)all-solid-stateZ-schememechanismphotocatalystsynthesizedviaatypicalhydrothermalmethodinacontrolledmanner.Therecombinationofthephoto-inducede–hpairscouldbeeffectivelyrestrainedbytheZ-schemepassagewaybetweentheflg-C3N4andα-MoO3NNsinthecomposite,whichcouldalsopromiseahighredoxabilitytodegradepollutants.Anditbecamepossibleforthepreparedphotocatalysttoabsorblightinawiderangeofwavelengths.Thedetailedmechanismwasstudiedbyelectronspin-resonancespectroscopy(ESR).Thelow-dimensionalnanostructureofthetwoconstituents(α-MoO3NNswithone-dimensionalstructureandflg-C3N4withtwo-dimensionalstructure)endowedthecompositewithvarietiesofexcellentphysicochemicalproperties,whichfacilitatedthetransferanddiffusionofthephotoelectronsandincreasedthespecificsurfaceareaandtheactivesites.The10wt%flg-C3N4/α-MoO3NNsshowedthebestphotocatalyticperformancetowardRhBdegradation,therateofwhichwas71.86%,~2.6timeshigherthanthatofα-MoO3NNs.

简介：WereportQ-switchedandmode-lockederbium-dopedall-fiberlasersusingternaryReS2(1-x)Se2xassaturableabsorbers(SAs).ThemodulationdepthandsaturableintensityofthefilmSAare1.8%and0.046MW∕cm2.InQ-switchedmechanismoutput,thepulsewascenteredat1531.1nmwithmaximumpulseenergyandminimumpulsewidthof28.29nJand1.07μs,respectively.Inmode-lockedoperation,thepulsewascenteredat1561.15nmwithpulsewidthof888fs,repetitionrateof2.95MHz,andmaximumpulseenergyof0.275nJ.Tothebestofourknowledge,thisisthefirstreportonthemode-lockedEr3+-dopedfiberlaserusingternarytransitionmetaldichalcogenides.Thisworksuggestsprospective2D-materialSAscanbewidelyusedinversatilefieldsduetotheirattractiveoptoelectronicandtunableenergybandgapproperties.

简介：麦兜是一只单纯乐观，资质平平的猪，他也有很多梦想，在最新上映的《春田花花同学会》里，哪怕是最微不足道的快乐，好比简简单单一个“斋卤味”都可以被当成奥运冠军般浓墨重彩地歌颂。在麦兜的世界里，快乐就是这样单纯的事情，