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1、(1)用arepetitionrateof1kHzawavelengthof800nm.40X,NA=0.65microscopeobjective在LiNb()3屮能诱导负的折射率改变FIGURE1Refractiveindexprofilesoftwotypicalwaveguidesmeasuredwithashearinginterferencemicroscopeatawavelengthof550nm.(a)Ancand(b)Anoofawaveguideinz-cutLiNbO3writtenwith1pJ,4
2、20fspulses.(c)Aneand(d)Anoofawaveguideinanx-cutciystalwrittenwith0.2pJ,380fspulses,(e)Waveguidemodefieldatawavelengthof633nmcorrespondingtotherefractiveindexprofileof(c)BothstructuresshowanincreasesolelyintheextraordinaryindexHe.Theordinaryindex/7oisdecreasedinboth
3、crystals.(上图【I5e.均有上升，［ftMo均右下降)Atlowerintensities,anincreaseoftheextraordinaryrefractiveindex/?ewasobservedthatcanbeusedtoformhigh・qualityopticalwaveguides・Higherintensitiescauseadecreaseofnoandncaccompaniedbystressinthesurroundingcrystalaswellasmaterialdamage・(在激
4、光强度较咼的吋候川和g均有下降)Structuralpropertiesoffemtosecondlaser-inducedmodificationsinLiNbO3j.burghoffl,_h.hartungls>noltela.t->unnermann1,2IBaO)15SrF210MgF2)18SrF210MgF2)variousglassesNolteb,A・Tu"nnermannb(2)在UBK7(74SiO210B20315Na20/K20FP10(lOSr(P03)235A1F330CaF2FP20(20Sr(
5、P03)230A1F322CaF2中会产生负的折射率Femtosecond-laser-writinginD.Ehrta,*,T・Kittela,M.Willb,S.JournalofNon-Crystal1ineSolids345&346(2004)332-337GhsscompositionsandpropertiesComposition(mol%)SdA(lOOSiOjUBK7(74S心10BQ15Na2O/K2OIBaO)UV.DURAN(82SiO212B2O35Na2(XK2OlAbOjBAP(74BO9A12
6、O317PbO)BB(50B2()350Bi2O3
7、FP10(10Si(PO3)235AIF?3OCaF215SrF2lOMgFjFP20(20Sr(PO3)23OAIF322CaF,18SrF210MgF2)CVD150016201300125010001050T,(°C)1120560530480420440480adO^K'1)6753360110160155%1.46021.51461.47331.61602.0651.46021.5M2Ve68646644199080p(g/cm)2.202.53■•■■3.146
8、.633.453.52IW-edge(nm)150195175300400160165bandgap(eV)8.26.37.04」107.87.5An(nm)+50-100+6010045-120-1905(10")+10-5+6-10-50Snfs-laserinduceddifferenceofopticalpathlength.Anfs-laserinducedrefractiveindexchangemeasuredwithdifferentmethods.激光光源为：约50fspulseswitharepctiti
9、onrateoflkllzatawavclcngthof800nmwasused文中说到折射率的改变不仅和写入波导的条件有关，还和玻璃的组份和结构有一定的关系。(1)在Nd3t・dopedBK7glass屮会有折射率的降低。Laserwritingofwaveguidesinphotose
