用于激光光束整形的衍射光学元件设计

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1、大连理工大学博士学位论文用于激光光束整形的衍射光学元件设计姓名：林勇申请学位级别：博士专业：光学工程指导教师：胡家升20091201用丁．激光光束整形的衍射光学元什设计DesignofdiffractiveopticalelementsforlaserbeamshapingAbstractRecently,lasertechnologyhasbeenwidelyappliedinmanyfields，suchasindustry,agriculture，medicalandhealth，nationaldefen

2、se，andscientificresearch．Itisdifficulttofindafieldwhichisnotconnectedwiththelasertechnology．However,somepropertiesoflaserbeamslimititsfurtherapplication．Forexample，itsintensitydistributionisGaussianprofile，notuniformone．Andpropagationpathishyperbolicline，nots

3、traightline．Inordertoextendtheapplicationfieldandimproveapplicationleveloflasertechnology，itisverynecessarytoshapelaserbeamsformeetingthedemandsofdifferentoccasions．Diffractiveopticalelementshavemanyadvantages，suchassmallsize，lightweight，replicatingeasily，low

4、cost，highdiffractionefficiency，manydesignvariables，widerangeofoptionalmaterials，peculiarchromaticdispersionperformances,andSOon．Thereforetheycanimplementsomenewfunctions，forexamplemicrominiatrue，array,integrationandarbitrarywavetransformation，whicharedifficul

5、tfortraditionalopticalelementstorealize．Diffractiveopticalelementshavewideapplicationprospectinlaserbeamshaping．Designmethodsofdiffractiveopticalelementsforbeamshapingareinvestigatedinthisdissertation，whichmainlyincludetheimprovementofalgorithmsbasedonscalarm

6、odel，thedesignofsub-wavelengthdiffractiveopticalelementsbasedonvectormodel，andthedesignoflensaxiconforsimulatingtheaxiconperformanceanddiffractiveopticalelementsforach!evinglongdepthoffocusandsmallspotbyZEMAX．Themainworkscontainedinthisdissertationareasfollow

7、s：1．TheGSGAhybridalgorithm，theprofile—smoothingalgorithm，andfuzzycontroliterativealgorithmareproposedfordesigningdiffractiveopticalelementsforlaserbeamshapinginthescalardomain．Computer-designedresultsshowthevalidityofthosealgorithms．Especiallyfuzzycontroliter

8、ativealgorithm，applyingthefuzzycontroltheorytodesignDOE，canintellectivelychoosetheoptimizationpathbyfuzzydecision，whichwillenableittoavoidbeingtrappedintolocaloptimumsolution．2．Thedesigno