High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression-中国期刊网

摘要 Anall-fiberizedandnarrow-bandwidthmasteroscillatorpoweramplification(MOPA)systemwithrecordoutputpowerof4kWlevelandslopeefficiencyof78%isdemonstrated.Tandempumpingstrategyistentativelyintroducedintothenarrow-bandwidthMOPAsystemforthermallyinducedmodeinstability(TMI)suppression.ThestimulatedBrillouinscattering(SBS)effectisbalancedbysimplyusingone-stagephasemodulationtechnique.Withdifferentphasemodulationsignals,SBSlimitedoutputpowersof336W,1.2kWand3.94kWarerespectivelyachievedwithspectralbandwidthsaccountingfor90%powerof~0.025,0.17and~0.89nm.Comparedwithourprevious976nmpumpingsystem,TMIthresholdisoverallboostedtobe>5timesinwhichtandempumpingincreasestheTMIthresholdof>3times.Thebeamquality(M~2factor)oftheoutputlaseriswellwithin1.5belowtheTMIthresholdwhileitisultimatelysaturatedtobe1.86withtheinfluenceofTMIatmaximaloutputpower.ExceptforSBSandTMI,stimulatedRamanscattering(SRS)effectwillbeanotherchallengeforfurtherpowerscaling.InsuchahighpowerMOPAsystem,multidetrimentaleffects(SBS,SRSandTMI)willcoexistandmaybemutual-coupled,whichcouldprovideawellplatformforfurthercomprehensivelyinvestigatingandoptimizingthehighpower,narrow-bandwidthfiberamplifiers.

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High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

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High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

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