Dense spectral beam combining with volume Bragg gratings in photo-thermo-refractive glass.pdf

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1、DENSESPECTRALBEAMCOMBININGWITHVOLUMEBRAGGGRATINGSINPHOTO-THERMO-REFRACTIVEGLASSbyOLEKSIYG.ANDRUSYAKM.S.UniversityofCentralFlorida,2004AdissertationsubmittedinpartialfulfillmentoftherequirementsforthedegreeofDoctorofPhilosophyintheCollegeofOpticsandPhotonic

2、sattheUniversityofCentralFloridaOrlando,FloridaSpringTerm2009MajorProfessor:LeonidB.GlebovUMINumber:3357889INFORMATIONTOUSERSThequalityofthisreproductionisdependentuponthequalityofthecopysubmitted.Brokenorindistinctprint,coloredorpoorqualityillustrationsan

3、dphotographs,printbleed-through,substandardmargins,andimproperalignmentcanadverselyaffectreproduction.Intheunlikelyeventthattheauthordidnotsendacompletemanuscriptandtherearemissingpages,thesewillbenoted.Also,ifunauthorizedcopyrightmaterialhadtoberemoved,an

4、otewillindicatethedeletion.______________________________________________________________UMIMicroform3357889Copyright2009byProQuestLLCAllrightsreserved.ThismicroformeditionisprotectedagainstunauthorizedcopyingunderTitle17,UnitedStatesCode._________________

5、______________________________________________ProQuestLLC789EastEisenhowerParkwayP.O.Box1346AnnArbor,MI48106-1346©2009OleksiyG.AndrusyakiiABSTRACTBeamcombiningtechniqueshavebecomeanimportanttoolinthedesignofhigh-powerhigh-brightnesslasersystems.Spectralbea

6、mcombining(SBC)isanincoherentcombiningtechniquethatdoesnotrequirephasecontrolofsources,allowingforastableandrobustsystem.UsingSBC,beamsfromanarrayoflaserswitheachelementoperatedatadifferentwavelengtharecombinedintoasinglenear-diffraction-limitedbeamwiththe

7、sameapertureusingdispersiveopticalelements.SBCbymeansofvolumeBragggratings(VBGs)utilizesuniquespectralresponseofVBGs:diffractionefficiencyisclosetounitywhentheBraggconditionissatisfiedandisclosetozeroatmultiplepointscorrespondingtoparticularwavelengthoffse

8、tsfromBraggcondition.High-efficiencyVBGscanberecordedinUV-sensitivephoto-thermo-refractive(PTR)glass.Narrow-bandreflectingVBGsallowmulti-channelSBCwithhighspectraldensityofchannels.Inthisdissertation,experime