简介:Areviewontheprogressofpowerful2μmsilicafibersourcesinpastdecadesispresented.Wereviewthestate-of-the-artrecordsandrepresentativeachievementsof2μmhigh-average-powercontinuouswave,pulsedfiberlasersandamplifiers,andpowerfulsuperfluorescentsources.Challengeswhichlimitthefurtherpowerscalingof2μmsilicafibersourcesarediscussed,includingpumpingbrightnesslimitation,thermalproblem,andnonlineareffects.Potentialandpromisingroadmapstogobeyondtheselimitations,liketandempumpingandbeamcombining,arediscussed.Prospectsofpowerful2μmsilicafibersourcesarealsopresentedintheendofpaper.
简介:Amolybdenumdisulfide(MoS2)saturableabsorberwasfabricatedbythermallydecomposingtheammoniumthiomolybdate.ByusingtheMoS2absorber,acompactdiode-pumpedpassivelyQ-switchedTm:GdVO4laserhasbeendemonstrated.AstableQ-switchedlaserwithrepetitionratesfrom25.58to48.09kHzwasachieved.Maximumaverageoutputpowerwas100mWwiththeshortestpulsedurationof0.8μs.Maximumpulseenergyis2.08μJatcenterof1902nm.
简介:Wereporteddiversesolitonoperationsinathulium/holmium-dopedfiberlaserbytakingadvantageofataperedfiber-basedtopologicalinsulator(TI)Bi2Te3saturableabsorber(SA).TheSAhadanonsaturablelossof53.5%andamodulationdepthof9.8%.Stablefundamentallymode-lockedsolitonsat1909.5nmwithdistinctKellysidebandsontheoutputspectrum,apulserepetitionrateof21.5MHz,andameasuredpulsewidthof1.26pswereobservedinthework.Byincreasingthepumppower,bothbunchedsolitonswithsolitonnumberupto15andharmonicallymode-lockedsolitonswithharmonicorderupto10wereobtained.Toourknowledge,thisisthefirstreportofbothbunchedsolitonsandharmonicallymode-lockedsolitonsinafiberlaserat2μmregionincorporatedwithTIs.
简介:WithMoS2assaturableabsorber,passiveQ-switchingandQ-switchedmode-lockingoperationsofaTm-dopedcalciumlithiumniobiumgalliumgarnet(Tm:CLNGG)laserwereexperimentallydemonstrated.TheQ-switchedlaseremittedamaximumaverageoutputpowerof62mWandhighestpulseenergyof0.72μJ.Q-switchedmodelockingwasalsoobtainedintheexperiment.TheresearchresultswillopenupapplicationsofMoS2atthemid-infraredwavelength.
简介:2004年,《美术观察》的[热点述评]栏目曾讨论过关于“80后的思与看”的话题;2011年,[现象]栏目也曾发起过“‘80’后的群体意识与自我指认”的讨论。光阴荏苒,当今“80后”艺术家、理论批评家已经在很多领域中独当一面,而“90后”艺术家也早已悄然从学院毕业,并走上独立创作的道路。相信每一个当代艺术的见证者都能体验到这种青春的脉动和成长的速度。从2012年起,随着全国各大艺术院校毕业展的陆续启幕,首批从学院毕业的“90后”开始闪亮登场,以不可抵挡的爆发力迅速占领了人们的视线。人们惊讶地发现,原本被认为自私、叛逆的独生子女一代早已不再是当年懵懂的孩童,对于现实问题也有了自己的解读和世界观。2015年,最早的一代“90后”已经踏入了自己人生的第25个年头,这些年轻的艺术家的登场,又将对当代艺术带来哪些思想和新变?
简介:目的:探讨2μm激光治疗长期口服抗凝药物良性前列腺增生患者的安全性及有效性。方法:对28例长期服用抗凝药物良性前列腺增生患者行经尿道前列腺2μm激光“刀削面”式汽化切除术。结果:手术时间为30~70min,平均时间(45±13)min;术后持续膀胱冲洗1~3d;留置尿管2~6d,膀胱造瘘管于拔出尿管后次日拔出;术后住院时间4~7d。术后随访3~6个月,术前与术后6个月平均IPSS分别为:(22.7±4.5)分、(6.8±3.5)分;QOL分别为:(5.2±0.4)分、(2.2±1.2)分;Qmax分别为:(6.4±1.5)mL/s、(18.8±3.2)mL/s,上述三项指标与术前比较,均有明显改善(P<0.01)。结论:经过严格术前评估与恰当处理,2μm激光治疗长期口服抗凝药物良性前列腺增生患者安全有效。