掺镱大模场面积光子晶体光纤锁模激光器的特性研究

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1、天津大学博士学位论文掺镱大模场面积光子晶体光纤锁模激光器的特性研究姓名：宋有建申请学位级别：博士专业：光学工程指导教师：王清月;胡明列20090501ABSTRACTIntenseultrashortlaserpulsegenerationfromdiode··pumpedrare·-earth·-dopedphotoniccrystalfiberlasersisanovelapproachtoachievelow-costand．compactfemtosecondlasersource，whic

2、hisapromisingwork-horseonindustryandscientificresearch．Thephotoniccrystalfibercanscaleupthemodeareawhilekeepingasingleguidedmodeduetotheendlesssinglemodeproperty,whicheffectivelyscaledownthefibernonlinearity,andisidealforhighpowerlaserpulsepropagation．

3、Ahighenergymode-lockedfiberlaserisdevelopedinthisthesis．AsegmentofsinglepolarizationYtterbiumdopedlargemodeareaphotoniccrystalfiberlaserservesasthegainmedia，whileapieceofsemiconductorsaturableabsorbermirrorisusedforself-startedmodelockingoperation．Them

4、odelockingdynamicsundervariouscavitydispersionissystematicallyinvestigated．Thethesiscanbedividedintothefollowing6parts：1．Thefundamentalsoffemtosecondgeneration，thedevelopmentoffemtosecondlasertechnologyaswellasthewaveguidemechanismofphotoniccrystalfibe

5、rarepresented．ThetheoryofnonlinearpropagationofultrashortlaserpulsesinmediaiSintroduced．2．Anumericalmodelofmode．10ckedphotonic'crystalfiberlaserisbuilt，whichisusedtosimulatethepulsedynamicsinthefiberlaser．Thesimulatedresultsfittheexperimentalresultsver

6、ywell．3．Solitonmode．10ckedphotoniccrystalfiberlaserisexperimentallyinvestigated．Laserpulseswith900mWofaveragepower,19nJofsinglepulseenergyand570fsofpulsedurationareachievedfromthefiberlaser．Theinfluenceofpolarizationextinctionratioofphotoniccrystalfibe

7、ronoutputpulsequalityisanalyzed．Thenoiseofthelaser,includingenergyfluctuationandtimingjitterisalsomeasured．4．Stretchedsolitonmode．10ckedphotoniccrystalfiberlaserisexperimentallyinvestigated，pulsedurationasshortas78fsisachievedfromthelaser．Theboundedsol

8、utionpairsarealsoobservedinthefiberlaser5．Allnormaldispersionmode．10ckedphotoniccrystalfiberlaserisexperimentallyinvestigated，laserpulseswith2Wofaveragepower,40nJofsinglepulseenergy(correspondingto51MHzofrepetitionrate)and3．6psofpulsedu