简介:Areviewontheprogressofpowerful2μmsilicafibersourcesinpastdecadesispresented.Wereviewthestate-of-the-artrecordsandrepresentativeachievementsof2μmhigh-average-powercontinuouswave,pulsedfiberlasersandamplifiers,andpowerfulsuperfluorescentsources.Challengeswhichlimitthefurtherpowerscalingof2μmsilicafibersourcesarediscussed,includingpumpingbrightnesslimitation,thermalproblem,andnonlineareffects.Potentialandpromisingroadmapstogobeyondtheselimitations,liketandempumpingandbeamcombining,arediscussed.Prospectsofpowerful2μmsilicafibersourcesarealsopresentedintheendofpaper.
简介:Wepresenttherecentresearchprogressesofourgrouponmid-infraredpulsedfiberlasersat3μmbypassiveswitching.Threedifferentkindsofsaturableabsorbersincludingsemiconductorsaturableabsorber(SESAM),Fe2+:ZnSecrystal,andtopologicalinsulator(TI)wereusedtoperformthepulsegeneration,respectively.Thetemporalregimesofmodelocking,Q-switching,andQ-switchinginducedgainswitchingweregained.Somerelativediscussionsandprospectiveeffortsareproposedattheendofthispaper.
简介:Er3+/Ce3+共掺碲酸盐玻璃的组成teo2-geo2-li2o-nb2o5使用常规的熔融淬火技术在Er3+的潜在应用掺铒光纤放大器(EDFA)的制备。测定了玻璃样品的吸收光谱、上转换光谱和1.53μm波段荧光光谱。结果表明,1.53μm波段的荧光发射强度的Er3+掺杂的碲酸盐玻璃光纤与Ce3+引入适量明显改善,这是由于能量转移(ET)Er3+Ce3+。同时,1.53μm波段的光信号放大是基于速率方程和功率传输方程模拟,并在约2.4dB信号增益的增量在1532nmEr3+/Ce3+共掺碲酸盐玻璃纤维被发现。最大信号增益达到29.3dB的一个50厘米长的光纤在980nm泵浦功率为100MW,结果表明所制备的Er3+/Ce3+共掺碲酸盐玻璃是一个很好的增益介质的应用1.53μM宽带高增益掺铒光纤放大器。
简介:srzn2(PO4)2:在大气中的高温固相反应合成Sm3+荧光粉。srzn2(PO4)2:Sm3+荧光粉是通过紫外光有效激发(UV)和蓝色光,和发射峰被分配到2-6h54G5//2过渡(563nm),2-6h74G5//2(597nm和605nm)和2-6h94G5//2(644nm和653nm)。对srzn2发射强度(PO4)2:Sm3+的Sm3+浓度的影响,其浓度猝灭效应srzn2(PO4)2:钐也观察到。当掺杂离子(=Li,Na和K)离子的发光强度,srzn2(PO4)2:Sm3+可以明显增强。在国际照明委员会(CIE)的srzn2色坐标(PO4)2:Sm3+定位在橙红色的区域。结果表明,该荧光粉具有潜在的应用在白光发光二极管(LED)。
简介:为某人制作了非制冷探测器。探测器是基于as0.05sb0.95和as0.09sb0.91厚外延层生长在衬底上通过熔体外延(我)。GE浸没透镜在光导体。截止波长在as0.09sb0.91探测器明显延长至11.5μm,而且在as0.05sb0.95探测器是8.3μ室温,在6.8米和1μ200Hz调制频率波长DλP*峰值探测率为1.08×109厘米·典型/2·W-1为as0.09sb0.91光导型探测器,探测率D*在9μm波长为7.56×108厘米·典型/2·W-1,和11μm是3.92×108厘米·典型/2·W-1。在as0.09sb0.91探测器的探测率在波长长于9μM是一个数量比在as0.05sb0.95探测器高幅度的上升,砷(As)成分增加在as0.09sb0.91材料。
简介:Inthispaper,quartzcrystalmicrobalance(QCM)gassensorscoatedwithpolyehtyleneimine(PEI)wasutilizedforcarbondioxide(CO2)detection.Thesensingmechanismisbasedontheavailabilityofreversibleacid-basereactionsbetweenCO2moleculesandPEIatroomtemperature.TheexperimentalresultsrevealedthatthePEI/starchsensorexhibitedmuchhighersensitivitythanthatofpurePEI,andshowedapproximatelinearityoveraconcentrationregionrangingfrom500ppmto8000ppm.Theinfluenceofhumidityhadalsobeeninvestigated.Furthermore,theresponseandrecoverytimedeceasedastheoperationtemperaturesincreased.Finally,sensitivitylossafterconservationforseveraldaysandreversibilityofthesensorshadbeendiscussed.