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1、AberrationCorrectionUsingAdaptiveOpticsinanOpticalTrapCarrieVoycheck,2006AdvisedbyDanielG.Cole,ResearchAssistantDepartmentofMechanicalEngineeringIntroductiontrapiscreatedwhenthegradientforcesaregreaterthantheTheprocessingofopticaltrappingisextremelyusefulinscatt
2、eringforces.thebiologicalsciencesformanipulatingmicroscopicparticlesTheopticaltrappingsystemconsistsofalaserpropagatingandorganismsusinglaserlight.Imperfectionsintheelementsthroughfourlensesandintoaninvertedmicroscopeinordercomprisingtheopticaltrapcausedeformati
3、onsinthelasertotrapaspecimenonthestage.Herethebeampartiallybeam,whichdecreasetheeffectivenessofthetrap.Theoverfillsthemicroscopeobjective.MovingfromthelasertothewavefrontdistortiononthebeamcanbedescribedbyZernikeobjective,thefocallengthofthelensesare:500mm,(SLM,p
4、olynomialsordiskharmonicfunctions.Thecoefficientsofseebelow),750mm,300mm,and150mm.Themicroscopethesefunctionscanbemanipulatedtocompensatefortheobjectiveis100x(focallengthof1.64mm).Whenconstructingaberrationmakingadiffractionlimitedspot,andtherefore,asinglebeamopt
5、icaltrap,anobjectivewithahighnumericalamoreeffectivetrap.Theaberrationcorrectionisperformedapertureisnecessaryinordertobringthebeamtoatightfocus.usinganadaptivesimulationintheprogramminglanguageTwotelescopes,createdbyL1andL2,andL3andL4(FigureMATLAB.Threeelements
6、arerequiredinanadaptive2),areusedtomatchthesizeofthebeamattheentrancepupiloftheobjectivetothespatiallightmodulator(SLM).2Aspatialopticssystem:awavefrontsensor,acorrectiveelement,andafeedbackorcontrolloop.Asensorconsistingofapinholelightmodulatoriscapableofconver
7、tingdatainincoherentandapowermeter,oracameraandacostfunctionareusedopticalformintospatiallymodulatedcoherentopticalsignals.todetectandmeasuretheaberrationmodes.AmeansforTherearetwotypesofSLM’s:electricallywrittenandopticallycorrectingtheaberrationsdetectedbythes
8、ensorwascreatedwritten.Thelatterisusedhereandwillconvertanincoherentusingaspatiallightmodulator(SLM).Theadaptivecontrolimageintoacoherentimageforfurtherprocessingbyth