折射率改变材料

（1）用arepetitionrateof1kHz.awavelengthof800nm.40×,NA=0.65microscopeobjective在LiNbO3中能诱导负的折射率改变FIGURE1Refractiveindexprofilesoftwotypicalwaveguidesmeasuredwithashearinginterferencemicroscopeatawavelengthof550nm.(a)Δneand(b)Δnoofawaveguideinz-cutLiNbO3writtenwith1μJ,420fspulses.(c)Δneand(d)Δnoofawaveguideinanx-cutcrystalwrittenwith0.2μJ,380fspulses.(e)Waveguidemodefieldatawavelengthof633nmcorrespondingtotherefractiveindexprofileof(c)Bothstructuresshowanincreasesolelyintheextraordinaryindexne.Theordinaryindexnoisdecreasedinbothcrystals.（上图中ne.均有上升，而no均有下降）Atlowerintensities,anincreaseoftheextraordinaryrefractiveindexnewasobservedthatcanbeusedtoformhigh-qualityopticalwaveguides.Higherintensitiescauseadecreaseofnoandneaccompaniedbystressinthesurroundingcrystalaswellasmaterialdamage.（在激光强度较高的时候no和ne.均有下降）Structuralpropertiesoffemtosecondlaser-inducedmodificationsinLiNbO3j.burghoff1,_h.hartung1s.nolte1a.t¨unnermann1,2(2)在UBK7（74SiO210B2O315Na2O/K2O1BaO)FP10（10Sr(PO3)235AlF330CaF215SrF210MgF2)FP20（20Sr(PO3)230AlF322CaF218SrF210MgF2）中会产生负的折射率Femtosecond-laser-writinginvariousglassesD.Ehrta,*,T.Kittela,M.Willb,S.Nolteb,A.Tu¨nnermannbJournalofNon-CrystallineSolids345&346(2004)332–337激光光源为：约50fspulseswitharepetitionrateof1kHzatawavelengthof800nmwasused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。(3)在Nd3t-dopedBK7glass中会有折射率的降低。LaserwritingofwaveguidesinphotosensitiveglassesHeikeEbendorff-HeidepriemOptoelectronicsResearchCentre,UniversityofSouthampton,SouthamptonSO171BJ,UK激光光源为UV-laser244nm（4）在商业铒镱共掺磷酸盐玻璃中，在在低重频1KHz的飞秒激光下，可以实现正和负的折射率改变OriginoftherefractiveindexmodificationoffemtosecondlaserprocesseddopedphosphateglassTheoriginofthelocalrefractiveindexmodificationinfemtosecondlaserinscribedstructureshasbeeninvestigatedwithconfocalmicrofluorescenceimaging.Wehaveidentifiedtheoriginofboth,positiveandnegativerefractiveindexchangesinacommercialEr-Ybcodopedphosphateglassuponirradiationinthelowrepetitionrateregime(1kHz).（5）Femtosecondtime‐resolvedrefractiveindexchangesinCdS（0.75）Se（0.25）andCdS激光光源为：120fspulsesatλ=620nm，100‐μm‐thicksinglecrystalsofCdS0.75Se0.25andCdSat295K文章提到在I=3GW/cm2会有一个瞬时的负的折射率改变，在更高的强度下改变的时间更长，当I=30GW/cm2时会有10ps的改变，然后会有部分的恢复。（6）铝硅酸盐玻璃的折射率变化为正，其他的玻璃表现出负的或者不均匀的折射率变化Femtosecondlaser-inducedrefractiveindexmodificationinmulticomponentglasses文中在多组分的玻璃中用激光诱导折射率改变，硼酸镧和钠磷酸盐玻璃，硼硅，铝硅酸盐，和重金属氧化物，通过使用高空间分辨率的折射率分析技术。对各种组分的玻璃进行了分析。