简介:Thisyearof2010witnessesthe10thanniversaryoftheForumofChina-AfricaCooperation(FOCAC),whichhasprovidedasolidplatformforfurtherdevelopmentofSino-AfricantraditionalfriendshipandusheredinanewperiodofChina-Africacooperationinallfields.ThisarticlehighlightsthemostprominentachievementsofFOCACoverthepastthreeyears,whichhopefullywillenablethereaderstobetterunderstandChina'srecentengagementwithAfrica.
简介:Areviewontheprogressofpowerful2μmsilicafibersourcesinpastdecadesispresented.Wereviewthestate-of-the-artrecordsandrepresentativeachievementsof2μmhigh-average-powercontinuouswave,pulsedfiberlasersandamplifiers,andpowerfulsuperfluorescentsources.Challengeswhichlimitthefurtherpowerscalingof2μmsilicafibersourcesarediscussed,includingpumpingbrightnesslimitation,thermalproblem,andnonlineareffects.Potentialandpromisingroadmapstogobeyondtheselimitations,liketandempumpingandbeamcombining,arediscussed.Prospectsofpowerful2μmsilicafibersourcesarealsopresentedintheendofpaper.