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1、090430133李泽辉原文：Volumeholographicimaging(VHI)systemsincorporateavolumehologramasoneoftheopticalfieldprocessingelementsinthesystem.Threedimensionalvolumeimaginghasattractedmuchresearchinterestrecentlyforitswideapplications,bothinthemilitaryareassuchas3DLADARandthecivilareas,e.g.molecularbiomed
2、icalinvestigation,on-lineindustrialproductinspection,micro-fabricationinvestigation,etc.Afieldwithfastgrowingimportanceisthe3Dvolumeinvestigationoftheobjectsthatshowveryfastdynamicchangesevenintherangeofmicroseconds,e.g.molecularbiologicalprocess,micro-fabricationprocess,etc.Generallyspeakin
3、g,hologramisanopticalcomponentinwhichthereexistssomerefractiveindexmodulation.Themostcommonmethodtomakeahologramistousesomephotonic-sensitivematerialtorecordtheinterferenceoftwomutuallycoherentlightbeams.Forexample,youmayuseasilverhalide,andletitexposuretotheinterferencefringesoftwolaserbeam
4、s.Thenyoucandeveloptheexposedsilverhalidetomakeanamplitudehologram,oryoucanbleachittoaphasehologramtofutureimprovethediffractionefficiency.Conventionally,peopleusehologramtorecordthe3Dsceneofanobject,asyoumayseeinalotofsciencemuseums.Mostofthesehologramsarecalledthinhologram,namely,theirhave
5、thinthickness,whichiscomparabletothewavelengthofthelight.However,wemainlyusevolumeholograminourresearch.Volumehologramtypicallyhasathicknessofmoredozensofwavelengths.Theoriesareusuallyusedintreatingtheopticalbehaviorofthevolumehologramsarethreedimensionalscalardiffractiontheoriesorcoupledwav
6、etheory,uptothestrengthofthevolumehologram.However,theeasiestwaytounderstandvolumehologramistreatingitasa3DdiffractivelatticeandapplyingBraggdiffractiontheory.High-qualitysystemsusedinvideoconferencingarecalledtelepresencesystems.Theimagesarelife-sizeyetnottrulylifelike.Theylackthedepththatp
7、eoplewouldnormallyseeiftheywereinthesameroomtogether.Butthiscouldchangeinthefuturewithnewkindsofthree-dimensionaltelepresencesystems.ResearcherscansendamovingimageovertheInternetandshowitonaspecialscreeninclosetorealtime.Peoplewouldnothavetowearspe
