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《Akram et al. - 2010 - Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、Laserspecklereductionduetospatialandangulardiversityintroducedbyfastscanningmicromirror1,11M.NadeemAkram,*ZhaominTong,GuangminOuyang,12XuyuanChen,andVladimirKartashov1UniversityCollegeVestfold,InstituteofMicrosystemsTechnology,N3103Tønsberg,Norway2poLightAS,P.O.Box163,N-3192Horten,Norway*
2、Correspondingauthor:mna@hive.noReceived20January2010;revised10May2010;accepted17May2010;posted19May2010(Doc.ID123071);published4June2010Weutilizespatialandangulardiversitytoachievespecklereductioninlaserillumination.Bothfree-spaceandimaginggeometryconfigurationsareconsidered.Afasttwo-dime
3、nsionalscanningmicromirrorisemployedtosteerthelaserbeam.Asimpleexperimentalsetupisbuilttodemonstratetheapplicationofourtechniqueinatwo-dimensionallaserpictureprojection.Experimentalresultsshowthatthespecklecontrastfactorcanbereduceddownto5%withintheintegrationtimeofthedetector.©2010Optica
4、lSocietyofAmericaOCIScodes:030.6140,110.6150,120.2040.1.IntroductionandMotivationmicrolensarrayinthelaserilluminationpath[6],byAspecklepatternhappensduetothescatteringandusingastationaryphaseplatebasedonaBarkerorinterferenceofhighlycoherentradiationfromaroughBarker-likebinaryphasecodeatan
5、intermediateim-surface.Thebasictheoryofspeckleformation,itsageplane[7–9],byusingpartiallycoherentbeamsstatisticalproperties,andadetailedreviewofspeckle[10],byusingchangingHadamardphasepatternsreductionmethodsisexplainedin[1].Considerableinsideeachdetectorresolutionpixelatintermediateeffor
6、thasbeenmadetominimizethespecklenoiseimageplane[11,12],andbyusingamicromirror[13]tointroduceangulardiversity.inimagingapplicationswherelaserlightisusedasIfweuseamechanicallyvibratingorrotatingtheilluminationsource.Inimagingapplications,theelementinthelaserbeam,suchasisusedindetectorisanin
7、tensitydetectorwithfinitespatial[2,3,6,11,12],abulkycomponentisneededtovibrateandtemporalbandwidth.Hence,insuchsituations,orrotateathighspeed,whichmaynotbeverycon-thespace-time-integratedintensityspeckleiswhatisvenientorreliable.Ifweusemanylaserbeamsforperceivedbyth
