貝塞爾光束簡(jiǎn)介課件.ppt

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1、BesselBeam牛麗婷201410301OutlineBesselbeam基本介紹論文概要問(wèn)題討論2OutlineBessel基本介紹論文概要問(wèn)題討論3特種光束之間變換4l=3常用參數(shù)和公式5Bessel基本介紹論文概要問(wèn)題討論6Highqualityquasi-Besselbeamgeneratedbyround-tipaxicon7perfectaxicon產(chǎn)生的QBBTheintensityprofilealongthepropagationaxisisshowntogetherwi

2、thinvariantshapeoftheradialprofileattwoaxialpositionsz1andz28InfluenceoftheroundaxicontipNewwaverefractedbytheroundtippropagatesbehindtheaxiconandinterfereswiththeQBB.Thisresultsinaxialmodulationoftheopticalintensitywithaperiodλ/(1?cosα0),whereλisthe

3、wavewavelengthinthemedium.Duetotheinterferencetheradialintensitydistributionisnolongerinvariant(seeexamplesatz1andz2).9如何消除round-tipaxicon對(duì)QBB的調(diào)制10實(shí)驗(yàn)裝置ThedemagnifyingtelescopeismainlyusedforgenerationofnarrowhighintensityQBB11Anexampleofsuchbeampropa

4、gationbehindtheperfectaxiconandthroughsuchatelescopeisshowninFig3.Thewhitecurvesshowthenumericallycalculatedaxialintensityprofiles.光路12thespatialintensitydistributionwithandwithoutconsideredfiltersItcanbeseenthatthefiltrationdoesnotgivethesameaxialin

5、tensityprofileastheidealQBBandthetotalpowerinthebeamdecreases.Howeverfiltersofradiilargerthan2138μmprovideslowlyvaryingaxialintensityprofileswithoutanyoscillationsoveradistanceof2/3zmax.去除振蕩13Bessel基本介紹論文概要問(wèn)題討論1415