贝塞尔光束简介课件.ppt

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1、BesselBeam牛丽婷201410301OutlineBesselbeam基本介绍论文概要问题讨论2OutlineBessel基本介绍论文概要问题讨论3特种光束之间变换4l=3常用参数和公式5Bessel基本介绍论文概要问题讨论6Highqualityquasi-Besselbeamgeneratedbyround-tipaxicon7perfectaxicon产生的QBBTheintensityprofilealongthepropagationaxisisshowntogetherwi

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

3、wavewavelengthinthemedium.Duetotheinterferencetheradialintensitydistributionisnolongerinvariant(seeexamplesatz1andz2).9如何消除round-tipaxicon对QBB的调制10实验装置ThedemagnifyingtelescopeismainlyusedforgenerationofnarrowhighintensityQBB11Anexampleofsuchbeampropa

4、gationbehindtheperfectaxiconandthroughsuchatelescopeisshowninFig3.Thewhitecurvesshowthenumericallycalculatedaxialintensityprofiles.光路12thespatialintensitydistributionwithandwithoutconsideredfiltersItcanbeseenthatthefiltrationdoesnotgivethesameaxialin

5、tensityprofileastheidealQBBandthetotalpowerinthebeamdecreases.Howeverfiltersofradiilargerthan2138μmprovideslowlyvaryingaxialintensityprofileswithoutanyoscillationsoveradistanceof2/3zmax.去除振荡13Bessel基本介绍论文概要问题讨论1415