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1、Chin.Phys.BVol.26,No.1(2017)014202ElectromagneticallyinducedgratinginathermalN-typefour-levelatomicsystemYa-BinDong(董雅宾)†,Jun-YanLi(李俊燕),andZhi-YingZhou(周志英)DepartmentofPhysics,ShanxiUniversity,Taiyuan030006,China(Received22June2016;revisedmanuscriptreceived2September2016;publishedo
2、nline30November2016)Theelectromagneticallyinducedgratingeffectinthermalandcoldatomshasbeenstudiedtheoretically.Studieshaveshownthat,byadjustingtheparameters,thefirst-orderdiffractionefficiencyoftheprobebeaminthecoldatomicsystemandthethermalatomicsystemis34%and31%,respectively,whichisve
3、ryclosetotheidealdiffractionefficiencyofthesinusoidalgrating.However,itismoredifficulttopreparethecoldatomicsystemthantopreparethethermalatomicsysteminthepracticalapplication,sothestudyoftheelectromagneticallyinducedgratingeffectinthethermalatomicsystemmaybehelpfulforpracticalapplicati
4、ons.Keywords:electromagneticallyinducedgrating,phasemodulation,first-orderdiffractionefficiency,thermalatomicsystemPACS:42.50.Gy,42.65.AnDOI:10.1088/1674-1056/26/1/0142021.IntroductionEIGeffectinthethermalatomicsystemmaybeofsomehelptopracticalapplications.Inrecentyears,theatomiccoheren
5、ceeffectshavearousedwidespreadinterest.UsingastandingwavetoreplacetheTherestofthispaperisorganizedasfollows:inSectiontravelingwaveofelectromagneticallyinducedtransparency2,wegivethetheoreticalmodelandtheequations;theresults(EIT),[1,2]anelectromagneticallyinducedgrating(EIG)[3–5]ofthe
6、oreticalsimulationarediscussedinSection3;Section4isformed.Itisnoteasyforthetraditionalgratingtochangegivestheconclusion.thepropertiesofthegrating,however,theelectromagneticallyinducedgratingcanthroughthereal-timemodulatesignaland2.Modelandequationscouplingfieldtochangethepropertiesoft
7、hegratinginreal-TheN-typefour-levelatomicstructuremodelisshownintime,andthencanreal-timemodulatethediffractionoftheprobefield,thusovercomingthelimitationsoftheordinaryFig.1.Thehyperfinelevels52S1/2,F=1and2of87Rbaregrating.Hence,ithasgreatapplicationprospectsinall-opticalchosentobej1ian
8、dj2i,52P1/2,
