部分相干列阵激光束通过湍流大气的传输特性研究

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1、四川师范大学硕士学位论文部分相干列阵激光束通过湍流大气的传输特性研究姓名：李晓庆申请学位级别：硕士专业：光学指导教师：季小玲20100531中文摘要阵光束与单束高斯光束在自由空间和湍流大气中均可具有相同的方向性。但是，由角扩展和归一化远场平均光强分布所表征的部分相干H．G列阵光束的方向性是不一致的，而湍流可以使得两种描述一致。(4)采用湍流距离幻为参数，定量地研究了大气湍流对径向分布的GSM列阵光束扩展的影响。推导出了径向分布的GSM‘列阵光束的湍流距离研的一般解析表达式。研究表明选择合适的列阵光束

2、参数和光束合成方式可以减小湍流对径向分布的GSM列阵光束的影响。关键词：光束合成；高斯．谢尔模型(GSM)歹tJ阵光束；部分相干厄米一高斯(H-G)列阵光束；光束质量；传输特性：角扩展与方向性；湍流距离；IIAbstractStudyonthepartiallycoherentarraybeamspropagatingthroughatmosphericturbulenceMajor：OpticsPostgraduate：LiXiao．．qingSupervisor：JiXiao．．1ingAbst

3、ract：Laserarraybeamshavebeenattractedmuchattentionbecauseoftheirwideapplicationsinhigh—powersystem，inertialconfinementfusionandlligh-energyweapons，andSOon．Ontheotherhand，thepropagationoflaserbeamsinatmosphericturbulenceisatopicthathasbeenofconsiderable

4、theoreticalandpracticalinterest．Inpractice，apartiallycoherentandhighordermodelaserbeamsisoftenencountered．Inpractice，partiallycoherentandhighordermodelaserbeamsareoftenencountered．Therefore，itisveryimportanttostudythepropagationpropertiesofpartiallycoh

5、erentandhighordermodelaserbeamsthroughatmosphericturbulence．Themainworksinthisthesisaresummarizedasfollows：(1)111eRayleighrangeandthe膨一factoraretakenasthecharacteristicparametersofbeamquality,andthebeamqualityofradialGaussianSchell—model(GSM)arraybeams

6、isstudiedindetail．111eanalyticalexpressionsfortheRayleighrangeandthe砰一factorofradialGSMarraybeamsarederived．Itisshownthatforthesuperpositionofthecross-spectraldensityfunctiontheradialGSMarraybeamhasznthatislongerandhasthe膨一factorthatislowerthanthatfort

7、hesuperpositionoftheintensity．AscomparedtoasingleGSMbeamcenteredattheorigin，theradialGSMarmybeamhasthelongernoil一spreadingdistance，buthasthehigher砰．factor．(2)TheinfluenceofatmosphericturbulenceonthepropagationofsuperimposedpartiallycoherentHermite-Gaus

8、sian(H．G)beamsisstudiedindetail．TheIIIclosed·formpropagationequationofsuperimposedpartiallycoherentH．Gbeamsthroughatmosphericturbulenceisderived．Itisshownthatthen曲ulenceresultsiIlabeamspreadingandadecreaseofthemaximumintensity．However,t