Electromagnetically induced transparency..pdf

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1、ELECTROMAGNETICALLYINDUCEDTRANSPARENCYE:叫omago伽allyinofequalmagnitude缸ldOp•Onecanmakeopaqueresonantducedtransparencyisapositesign.OnedrivingtechniqueforeHminatingthetransitionstransparenttolaserradiation,termispt叩ortionaltotheeffectofamediumOnaoftenwithmostoftheatomsremainingprobabilitya

2、mplitudeofthepropagatingbeamofelectro•groundstate11).Theothelmagneticradiation.EITinthegroundstate.terrnisoppositelyphasedmayalsobeused,butunderandproportionaltotheprobmorelimi回dconditions,toabilityamplitudeofstate12)climinateopticalself-focus•StephenEHarmThesedtWIngtmnshaveinganddefocus

3、ingandtoim•吐1esamefr飞equencyω。andprovethetransmissionoflaserbeamsthroughinhomo•balancesuchthattheprobabilityampl比udeofstate13)geneousrefractinggasesandmetalvapors，皿figm宅1andtbeexpectedvalucoftheamplitudeofthesinusoidaliliustra恒s.ThetechniquemaybeusedteCl'eatelargemotionateachoftheapplied

4、[requenciesiszeropopulationsofcoherentlydrivenunifol1nlyphasedatoms,ThereÎsstilla8ubtlequestion:Howdoesthecoher•therebymakingpossiblenewtypesofopt<沱lectronicdcvicesenceoftheIIH2)transitionatomsbecomephasedsothat,τbattaintransparencyor,attheleast,toimprovetegetherwiththeappliedfieldatωCJi

5、twiIlcausethetransmission,oueappliestwolase>wavelengthswhosenecessarycancellation?There81'CtwowaysinwhichthatfrequenciesdifIerbyaRaman(nonallowed)transitionofmayhappen.Onei5thatiftheappliedlasersaremono•amedium.Figure2consis阳ofseveralexamplestowhichchromat叫thecoherencemayhaveanarbitraryp

6、hasetheconceptsofEITapply.Figul'e2adepictsaprotetypeand.withtime,theincorrectcomponentofthephaseisthree-statesystern.MostoftheexperimentsdescribedindampedQut.ButwhenweusepuJsedlasers,thereisnotthisarticleweredoneinathree-statelead-vaporsystemenoughtirnefor出attohappen.lnstead,asexpla.ined

7、ofthistype.Figul'e2bshowsasysteminwhichtl'ans•belo叫wenowknowhowtoinitiatethecoherenceoftheparencyistobecreatedatanenergythatisabovetheIIH2)tl'ansitionatomswiththeco町ectphaseandtoionizationpotentialofanatom.Figure2ciIIustratesamaintainthatphasethereafter,caseinwh.ich,inste