摻鐵鈮酸鋰中光生伏打暗空間孤子的理論及實(shí)驗(yàn)研究.pdf

1、南開(kāi)大學(xué)碩士學(xué)位論文摻鐵鈮酸鋰中光生伏打暗空間孤子的理論及實(shí)驗(yàn)研究姓名：田國(guó)云申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：凝聚態(tài)物理指導(dǎo)教師：劉思敏張光寅19980501摘要TheoreticalandExperimentalStudyontheDarkSpatialSolitoninLiNbO:FewritenbyTyanGuoyunmajorinCondensedMatterPhysicssupervisedbyProf.LiuSiminandProf

2、ZhangGuangyinABSTRACTKerrtypespatialsolitonshavebeenintensivelystudiedforthreedecades.ThiskindofsolitoncouldonlybeaccessedwithhighpowerlasertypicallyfromkWcmztoMWcm.Soitwouldbemorepopularifthespatialsolitonscanbeavailabl

3、einlowpowerlever.In1992M.Segevet.atpredictedsuchkindofspatialsolitonnamelyphotorefractivespatialsolitonwhichcouldbeobtainedinmuchlowerlaserpowereg.fromltWcm2tomwcm=.Andin1993G.C.Dureeet.alsuccessfullyobservedbrightspatia

4、lsolitonsinSBN:Rhcrystal.ThiseventmarkedthebeginningofthehotspotofspatialsolitonresearchswitchedfromKerrtypetophotorefactiveoneinthisdissertationwepresentawidescopeoftheoreticalandexperimentalstudyonthephotorefractivepho

5、tovoltaicdarkspatialsolitoninLiNb0:FecrystalespeciallyfocusonthenumericalsolutionofthenonlinearSchroedingerequation(NLSE)theexperimentalparametersefectuponthesolitonandtheinteractionbetweendarkspatialsolitonsforthebestof

6、whatweknowthisisthefirstreportonthisissue.Inchapter2wegivethedetailedproceduretonumericallysolvetheNLSE.Comparedwiththepreviousworkherewepresentamoreprecisesolution.Webelievethissolutionmaybeofvalueinmanyothercircumstanc

7、es.Withthistoolwegettheresultoftheexperimentalparametersefectonthebehaviorofthesolitonandtheinteractionbehaviorofthephotovoltaicdarkspatialsolitons.Inchapter3wereportourexperimentalresult.Underthelimitedexperimentalcondi

8、tionwejustinvestigatedthedarkspatialsolitonunderanoddconfiguration.Wecomparedthenumericalresultswiththeexperimentalonesandwefoundagoodagreementbetweenthem.Consideringthepotentialapplicationofthephotorefractivespatialsoli

9、tonherewepaidattentiontothewaveguideaswell.Wefoundthattherefractiveindexstructureinducedbythesolitoncanbeusedtoguideanotherlaserbeam.ThisphenomenonshowsustheapplicationperspectiveofthephotovoltaicdarkspatialsolitoninLiNb