摘要
Weexperimentallydemonstratedatypeoftunableandswitchableharmonich-shapedpulsegenerationinathulium-dopedfiber(TDF)laserpassivelymodelockedbyusinganultralongnonlinearopticalloopmirror.Thetotalcavitylengthwas~3.03km,thelongesteverbuiltforaTDFlasertoourbestknowledge,whichresultedinanultralargeanomalousdispersionover-200ps~2aroundtheemissionwavelength.Theproducedh-shapedpulsecanoperateeitherinafundamentalorinahigh-orderharmonicmode-locking(HML)statedependingonpumppowerandintra-cavitypolarizationstate(PS).Thepulseduration,nomatteroftheoperationstate,wastunablewithpumppower.However,pulsebreakingandself-organizingoccurred,resultinginhigh-orderHML,whenthepumppowerincreasedaboveathreshold.Atafixedpumppower,theorderofHMLwasswitchablefromonetoanotherbymanipulatingthePS.Switchingfromthe8thuptothe48thorderofHMLwasachievedwithafixedpumppowerof~4.15W.OurresultsrevealedthedetailedevolutionandswitchingcharacteristicsoftheHMLandindividualpulseenvelopewithrespecttoboththepumppowerandPS.Wehavealsodiscussedindetailthemechanismsofboththeh-shapedpulsegenerationandtheswitchingofitsHML.Thiscontributionwouldbehelpfulforfurtherin-depthstudyontheunderlyingdynamicsoflong-durationparticular-envelopepulseswithultralargeanomalousdispersionandultralongroundtriptime.
出版日期
2019年03月13日（中国期刊网平台首次上网日期，不代表论文的发表时间）
