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1、PYROELECTRICITYANDOPTICALSECONDHARMONICGENERATIONINPOLYVINYLIDENEFLUORIDEFILMSJ.G.Bergman,J.H.McFee,andG.R.CraneCitation:Appl.Phys.Lett.18,203(1971);doi:10.1063/1.1653624Viewonline:http://dx.doi.org/10.1063/1.1653624ViewTableofContents:http://apl.aip.org/resour
2、ce/1/APPLAB/v18/i5PublishedbytheAmericanInstituteofPhysics.AdditionalinformationonAppl.Phys.Lett.JournalHomepage:http://apl.aip.org/JournalInformation:http://apl.aip.org/about/about_the_journalTopdownloads:http://apl.aip.org/features/most_downloadedInformationf
3、orAuthors:http://apl.aip.org/authorsDownloaded19Sep2012to134.214.184.143.RedistributionsubjecttoAIPlicenseorcopyright;seehttp://apl.aip.org/about/rights_and_permissionsAPPLIEDPHYSICSLETTERSVOLUME18,NUMBER51MARCH1971PYROELECTRICITYANDOPTICALSECONDHARMONICGENERAT
4、IONINPOLYVINYLIDENEFLUORIDEFILMSJ.G.Bergman,Jr.,J.H.McFee,andG.R.CraneBellTelephoneLaboratories,Holmdel,NewJersey07733(Received10November1970)Orientedfilmsofpolyvinylidenefluoride[(CH2CF2).I.apolarpolymerpossessingsymmetrymm2,canbemadesignificantlypyroelectrica
5、ndopticallynonlinearbypolinginanelectricfield.Apyroelectriccoefficient(dP/dT=2.4±0.7nC/cm2oC)comparabletothatofsingle?crystalLiNb03isobserved.Thenonlinearopticalcoefficientsd33?d32?andd3!ofpolyvinyli?denefluoride(PVF2)aremeasuredrelativetoduofcrystallinequartz[
6、d33(PVF2)"'2d3!(PVF2)'"du(Si02);d32(PVF2)"'0).Thepoledfilmshavespecificadvantagesforpyroelectricdetectionofelectromagneticradiationandforopticalparametricdevices.Polyvinylidenefluoride(PVFa)isahighlycrys?andlargestindices,respectively.Thecorrelationtallinepolym
7、er[(CHaCFa).]belongingtotheacen?betweenobservedopticalanisotropyandfilmpre?tricpolargroupmm2.l,aKawaiahasrecentlyshownparation(uniaxialversusbiaxialstretChing)isthatpiezoelectricitycanbepermanentlyinducedevident.ThebirefringencesinTableIrefertoinstretchedPVFafi
8、lmsbyheatingthefilmstothefilmsasreceivedfromthemanufacturer.We-100DCandthenallowingthemtocoolinastrongsubjectedthemtonoadditionalstretching.Fur?electricfield(-300kV/cm).Weha
