铷原子共振布拉格散射光谱分析

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1、万方数据铷原子共振布拉格散射光谱研究为0。。实验中使用了两个分光比达105的格兰棱镜，这样散射光得以与后向泵浦光分开。关键词：简并四波混频；布拉格散射；布居数差光栅；格兰棱镜lI万方数据ABSTRACTTheaccuracyofopticalfrequencymeasurementsofatomictransitionsisveryimportantintheAtomsphysics．Butbecauseoftransitionofatom，theaccuracyoffrequencyoftheatomictransitionwaslimited．Inthee

2、arly1970s，saturatedabsorptionwasinventedanditcaneliminatetheDopplereffect．Sotheatomictransitionfrequencycanbemeasuredprecisely．Besidessaturatedabsorption，degeneratefour-wave—mixingwasstudiedtoo．In1972，HorocheandHartmanne1．proposedthepopulationdifferencegratingforthefirsttime．Atthesa

3、metime，degeneratefour-wave—mixing(DFWM)thatissomethingwiththepopulationdifferencegratingwasstudiedwidelybytheperson．ButtherelationofDFWMandBraggscatteringisneededtofurtherstudied．AndthestudywillprovidetheoreticalfoundationtothephysicalmechanismofDFWManditCanprovideahighersensitivity

4、spectroscopysignalforthestabilizationofthelaserfrequency．AbackwardresonanceBragg—scattering(RBS)spectroscopyfromapopulationdifferencegrating(PDG)ispresentedinthedissertation．Thespectroscopyhasanovelhigh—resolutionandahighsignal-to—noise(s／y)．Thisprovideagoodspectroscopysignalforhela

5、serfrequencystabilization．ApumpbeampropagatethroughRbatomsinthezdirectionandtheotherpumpbeampropagatethroughRbatomsinthe—Zdirection．Inthiscase，astanding—wavewascreatedbytheinterferencebetweenthetwopumpbeamsintheatomicvaporwhichperiodicallymodulatesthespacepopulationdistributionsoftw

6、olevelsintheRbatoms．Andapopulationdifferencegrating(PDG)isformed．Then，aprobebeam，havingtheidenticalfrequencyandtheorthogonalpolarizationwiththeSWpumpfield，isBragg—scatteredbythePDG．ThescatteredlightisthebackwardresonanceBragg—scattering(RBS)spectroscopy．Themainworksareasfollowing：1、

7、)ThebasictheoryandtheusualstructuresoftheDFWMarebrieflyintroduced．2)TheBragg—scatteringspectroscopyofRbD1isstudied．Andwe¨T——万方数据铷原子共振布拉格散射光谱研究——————————————————————————二二二=二==二=二=2=L—一proveexperimentallythattheBragg—scatteringspectroscopyisreallycomesfrompopulationdifferencegrating．

8、1、T1～‘j)上heBragg—sc