Subpicosecond pulses in a self-starting mode-locked semiconductor-based figure-of-eight fiber laser

(整期优先)网络出版时间:2017-01-11
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Wehaveexperimentallystudiedthemode-lockingdynamicsofapolarization-maintainingfigure-of-eightlaserwhichhasasemiconductoropticalamplifierasgainmedium.Self-startingmode-lockingatthefundamentalrepetitionrateof18MHzisobtainedatthelasingthreshold,andfurtherincreasingthebiascurrentleadstotheprogressiveemissionofadditionalopticalpulsesineachroundtripandeventuallytomode-lockedemissionatincreasinglyhighharmonicsofthefundamentalrepetitionrate,upto2.45GHz.Theintensityautocorrelationoftheamplifiedmode-lockedpulseshasafullwidthathalf-maximumdurationof382fs,whichcorrespondstoapulsedurationof247fs.