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1、四川大學碩士學位論文題目趣盆擔王造鯉籃獫犍蛙塹窒作者塞堡完成日期2壘鯪釜魚聶宦§Q園霆引夫學矮士學整論文非常接近矩形，則光柬的J】l，因子較大，若要求光束的且嚴因予較小，則足熊降低對光鞭矩形分布的溪求。4。槎導出了郟分相干平】燹必衷通過包禽線蛙增益或羧耗奔覆蛇ABCD光學系統(tǒng)的譜密度豳數的傳輸公式，詳細研究了介質的增簸或損耗特佼、波數實部、光束的相干長度以及光柬形狀等對光榮近場和遠場光譜變化的影響。5．基于Herrero等在對截斷光束空間一頻率域強度二階矩的修改瑗論，給出了裁甄斃素廣義磊嚴囂子溺豢戇理論依據彝溺董方法，建立了灝蠢系統(tǒng)，莠霹安驗結
2、果進彳亍了分析。關鍵詞：部分相干光，廣義^嚴因子，激光的模分解，具有增益(損耗)介質，傳輸特性，測量方法本論文工作得到國家自然科學基金項目(編號：60108004)的資助。四川大學碩士學位論文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玨i鞘翹大學疆士學控論文wasderived。Furthermore，thetypicalnumericalexampleshavebeengivenandthecalculationprecisionofourmethodhasbeenanalyzedbynumericalcalculations．2。Consideringofthecomplexwavenumber,thesecond-orderintensitymomentsan
8、dt1擗膨-factorofpartiallycoherentbeamsingainorabsorbingmediahavebeenmodified．
