部分相干光的传输特性研究

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1、四川大学硕士学位论文题目趣盆担王造鲤篮猃犍蛙堑窒作者塞堡完成日期2垒鲮釜鱼聂宦§Q园霆引夫学矮士学整论文非常接近矩形，则光柬的J】l，因子较大，若要求光束的且严因予较小，则足熊降低对光鞭矩形分布的溪求。4。槎导出了郏分相干平】燹必衷通过包禽线蛙增益或羧耗奔覆蛇ABCD光学系统的谱密度豳数的传输公式，详细研究了介质的增簸或损耗特佼、波数实部、光束的相干长度以及光柬形状等对光荣近场和远场光谱变化的影响。5．基于Herrero等在对截断光束空间一频率域强度二阶矩的修改瑗论，给出了裁甄毙素广义磊严嚣子溺豢戆理论依据彝溺董方法，建立了灏蠢系统，莠霹安验结

2、果进彳亍了分析。关键词：部分相干光，广义^严因子，激光的模分解，具有增益(损耗)介质，传输特性，测量方法本论文工作得到国家自然科学基金项目(编号：60108004)的资助。四川大学硕士学位论文StudyonpropagationpropertiesofpartiallycoherentbeamsMajor：OpticsGraduatestudent：OiaoWenSupervisor：ProfessorBangweiCaiAbstractLaserbeamcharacterization，beampropagation，beamtransfor

3、mationandbeamqualitycontrolarealwaysthefundamentalresearchsubjectsinlaseropticsandlasertechnology．Laserbeamsgeneratedfromhigh-powerlasersusuallyresultinacomplexmulti·modestructureandpossesspartialcoherencebecauseofthehi曲gain，largeaperture，amplificationofspomaneousemission，no

4、nlinearopticaleffects，diffractionofcavitymirror,aswellasthevariationoflasercontrolparameters．ItwouldbeofimportamsignificancetOstudythelaserbeamcharacterization，beampropagation，modedecompositionandbeamqualitycontr01．髓egoalofthisthesisis幻studythepropagationproperties．thebeampr

5、opagation膨factorandthetheoryofmodedecompositionofthepartiallycoherentbeams．nlemainresultsobtainedinthisthesiscanbesummarizedasfollow：1．Basedonthetheoryofsecond—ordermomentsandthetreatmentthattherectangularfunctioncanbeexpandedintotherealpartofanapproximatesumofcomplexGaussia

6、nfunctionswithfmitenumbers，anapproximatemethodforcalculmingthesecond-ordermomentsandthegeneralized∥-factorofpartiallycoherentbeamspassingthroughhard-edgedapertureshasbeenproposed．Alaserbeamwithamplitudemodulationandphasefluctuationwastakenasatypicalexampleofpartiallycoherent

7、beams．TheanalyticalexpressionforthegeneralizedM2-factor珏i鞘翘大学疆士学控论文wasderived。Furthermore，thetypicalnumericalexampleshavebeengivenandthecalculationprecisionofourmethodhasbeenanalyzedbynumericalcalculations．2。Consideringofthecomplexwavenumber,thesecond-orderintensitymomentsan

8、dt1擗膨-factorofpartiallycoherentbeamsingainorabsorbingmediahavebeenmodified．