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1、InvitedPaperNovelLaserBeamSteeringTechniquesHansDieterThollDept.ofOptronics&LaserTechniquesDiehlBGTDefencePOBox101155,88641Überlingen,GermanyABSTRACTThepapersummarizeslaserbeamsteeringtechniquesforpowerbeaming,sensing,andcommunicationapplications.Prin
2、ciplesandcharacteristicsofnovelmechanical,micro-mechanicalandnon-mechanicaltechniquesarecompiled.Micro-lensbasedcoarsebeamsteeringincombinationwithliquidcrystalorelectro-opticalphasecontrolforfinesteeringispresentedinmoredetail.Thisreviewaddressesbeam
3、steeringdeviceswhichmodulatethephasedistributionacrossalaserbeamandexcludesintra-cavitybeamsteering,beamsteeringbasedoncombiningtuneablelaserswithdispersiveopticalelements,activeopticalphasedarrays,andopticalwaveguides.Keywords:Laserbeamsteering,optic
4、alphasedarrays,decenteredmicro-lenses,spatiallightmodulators1.INTRODUCTIONTheintegrationoflaserpowerbeaming,laser-assistedsensing,andlasercommunicationsubsystemsintoautonomousvehicles,airborneandspaceplatformsdemandsnewtechniquestosteeralaserbeam.Then
5、ewtechniquesshouldpromotetherealizationofbeamsteeringdeviceswithlargeopticalapertureswhichareconformallyintegratedintothemechanicalstructureoftheplatform.Thewishlistofrequirementscomprisewell-knownproperties:compact,lightweight,lowpower,agile,multi-sp
6、ectral,largefieldofregard.Theangularspreadofalaserbeam,especiallyforlongrangeapplications,isinherentlysmallbecauseofthehighantennagainofaperturesatopticalwavelengths.Consequently,thedirectionofpropagationofalaserbeamisgenerallycontrolledintwosteps:(1)
7、Aturretwithgimballedopticalelementspointsthefield-of-viewofatransmitting/receivingtelescopeintotherequireddirectionandcompensatesforplatformmotionswithmoderateaccuracyandspeed.(2)Abeamsteeringdevicesteersthelaserbeamwithinthefield-of-viewofthetelescop
8、einordertoacquireandtrackatarget.Thesubjectmatterofthisreviewarenovellaserbeamsteeringtechniques.Beamsteeringdevicesarecapableof•pointingalaserbeamrandomlywithinawidefield-of-regard,•steppingthebeaminsmallincrementsfromoneangularpositiontothen
