超短激光脉冲在钕玻璃放大介质中传输特性研究

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1、西南交通大学研究生学位论文超短激光脉冲在钕玻璃放大介质中传输特性研究年姓级名二o0四级胡军申请学位级别工学硕士专业光学工程指导教师周小红副教授二oo七年六月西南交通大学硕士学位论文第1I页AbstractAmplifierisaimportantpartthatprodu懈highpowerultra-shortpuis．Soitisaveryimportantthemetostudyamplifyingpropagationandpropertiesofthispulseinamplifyingmedium．Inthispaper,afterconsideringKerrno

2、nlineareffect,groupvelocitydispersionofhost,gainspcc岫，gainsaturationofamplifyingmediumandfrequencyfluctuationofopticpulse．ThepropagationcharacteristicsofchirpedinNd”：gIa鹳l础ampiif伽gmediumhasbeenresearchcd’theresults伽provide$OIIICtheoretical鲥forfugtheradvantageandplll∞shapingofampler．Themainwo

3、rksofpaperareasfollows：1．FromtheMaxwell'sequations,thebasicepuation,thenonlinearparaxialequationofsloww“／ingamplitudeofopticalpulseinamplifyingmediumhasbeendeduced,andobtaintwodesriptionmethods．Furthmore,thegainproperty,groupvelocitydispersionpropertyandKerrnonlinearef岱ectpropertyofN矿+：glass

4、amplifyingmediumhavebeenanalyzedindetail．2．ByusingtheFouriertransformationmethod,weresearchedthepropagationcharacteristicsofpul∞shape，frequencyspectrumphaseshiftofapssuper-GanssionpulseinNd3*：glasslaseramplifyingmediumlengthwhen∞oiso)g,anddiscussedtheinfluenceofdispersion,gainsl圮．．ctnlm，gain

5、saturationandnonlineareffectofmediumtothem．硒口numericalcalculationsandanalysisshowthat，Thedispersionandthegainspex'manofpsopticalpulscinthemediumc蛆beignored．buttheKerrnonlineareffectandthegainsaturationwillchangeshapeofthepulse．TheKerrnonlineareffectwillchangethespectiumofthepulsetogetherwith

6、thegainsaturation．3．Theinfluencesoffrequencyfluctuationtopulseshapehasbeenanalyzed,andnumericalcalculationshasbeendowntoitbyusingFouriertransformationmethod．Theresultsshowthattheintensityofopticalpulse西南交通大学硕士学位论文第lIl页decieasesasitsfrequencyfluctuationincreases．Thefrequencyfluctuationwillcha

7、ngetheCVallIeSSofpulsetogetherwithchirpparameter．Thisisthesameoroppositecomparedwiththegainsaturation．Anditalsoprovidescertaintheoreticalforpulseshapingofamplifier．K留words：Nd：glassamplifyingmedium；propagationproperty；chjfpcd—pulse：frequencyfluctuat