采用空心金属波导的原子导引及其空心光束的产生

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1、华东师范大学硕士学位论文采用空心金属波导的原子导引及其空心光束的产生姓名：代萌申请学位级别：硕士专业：光学指导教师：印建平20050501AbstractThemethodsforlaserandmagnetguidingofneutralatomsincludered—detunedlaserguiding，biued-detunedlaserguiding，current-carryleadguiding，current-carryconductorguidingandpermanentmagnetatomicguidingarebrieflyintroducedint

2、hispaper,wealsointroducedthedefinitionofatomicfiumelanditsbasicprincipleandgeneration，finally,thepotentialapplicationsofatomicfimnelinatomopticsarediscussed．Weproposedanewschemetoguidecoldatomsusingablue—detunedTE01doughnutmodeinahollowmetallicwaveguide@10microns)，itinvolvedtheadvantagesof

3、bothblue—detunedlaseratomicguidinghollowfiberatomicguiding．Wecalculatedtheelectromagneticfielddistributionoftheguidingmodesinthehollowmetallicwaveguide，discussedthemodeattenuationcharacteristicinwaveguidesofdifferentmediaandradius，andfindthemethodtorestrainothermodes’propagation：modematchi

4、ngandchoosingtherightmediatoincreasetheEHl1mode。sattenuation。FortheTE01modewhichisrepresentedbythefistkindBesselfunction，wecalculateditsopticintensitydistribution，thencalculatedtherelationshipbetweenitsopticalpotentialforthetwo—level85Rbatomsandthedetaning，andestimateitsphotonscatteringrat

5、e．WefindthattheopticaIpotential(U。。=570inK)oftheTE01modeishighenonghtoloadcoldatoms(-120／．tK)fromastandardmagneto—opticaltrapandguidethemintheHMW．andthephotonscatteringrateisSOlowthatCanbeneglect．Itprovedthatourschemeisdesirabletorealizeacomputer-controlledatomlithographywitllanarbitrarypa

6、ttem．Diffractedneal--andfar-fielddistributionsoftheTE0t·-modeoutputbeamundertheFresnelapproximationarestudiesWefindtheoutputbeamisadarkhollowonewhichCanbeanalyzedbythepattemofaTEM01+donutmode．Whenwepayattentiontothenear—field，wefindthatthebeamwillbefocusedbyitselfinashortpropagationdistanc

7、e，fora20一micron—radiushollowwaveguide，thefocuswillappearswhenitpropagateabout300microns，andtheDSSwilldecreasefrom10．5micronsto6．2microns．Wechangedtheradiusandobtainedasimilarresult．Finally，wediscussedtheTE01outputbeam’Spotentialapplicationsinatomoptics，suchasa