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1、CTuP51High-powerlaserbeamcontrolbyPTRBragggratings(1)(1,2)(1)(1)(1)IgorCiapurin,VadimSmirnov,GeorgeVenus,LarissaGlebova,EugeniuRotari,(1)andLeonidGlebov(1)CREOL,UniversityofCentralFlorida,P.O.Box162700,Orlando,FL32816-2700Tel.(407)823-6800,Fax(407)823-6880,E-mail:igor@creol.ucf.edu,lbglebov@mail.uc
2、f.edu(2)LightProcessingandTechnology,Inc.,4028LaurelBranchLane,Orlando,FL,32817Tel.(407)617-2869,Fax(407)673-2578,E-mail:vadim@l-p-tech.comAbstract:VolumeBragggratings(VBG)withefficiencyexceeding95%recordedinanovelpatentedmaterial,whichisaphoto-thermo-refractive(PTR)glass,andusedforhigh-powerlaserb
3、eamcontrol.Exceptionallynarrowspectraland/orangularselectivityareusedforangularmagnificationinlaserscanners,spectralbeamcombining,andspectralstabilizationofsemiconductorlasers.2004OpticalSocietyofAmericaOCIScodes:(090.7330)Volumeholographicgratings,(140.3460)Lasers,(160.2900)Holographicrecordingma
4、terialsVolumeBragggrating(VBG)isthekeycomponentinvariousopticalsystemsappliedforlasers,medicine,opticalcommunication,aerospace,etc.,becauseoftheirhighspectralandangularselectivity.TransmittingandreflectingVBGsrecordedinPhoto-Thermo-Refractive(PTR)glasshaveabsoluteefficiencymorethan95%andveryhighthe
5、rmal,chemical,andmechanicalstability[1-3].AfterexposuretoUVradiationrangedfrom280to350nmfollowedbythermaldevelopmentintherangeof500°C,thePTRglassprovidesrefractiveindexmodulationupto-3-510.CurrenttechnologyprovidesPTRglasswithrefractiveindexfluctuationsbelow10atapertureupto50mm.2TypicaldosageofUVra
6、diationforhighdiffractionefficiencyisbelow1J/cm.Severalhighefficientgratingswithdifferentperiodsandtiltscouldberecordedindependentlyinthesamevolumeofglass.Animportantfeatureof2diffractiveelementsinPTRglassistheirhighlaser-induceddamagethresholdupto10J/cmfor1nspulsewidthat21058nmandstabilityinCWlase
7、rbeamsupto100kW/cmat1100nm.ThisworkdescribesPTRVBGsapplicationforangularmagnification,spectralbeamcombining,andspectralstabilizationofsemiconductorlasers.Forscanningoflaserbeams,theliquidcrystalphase1.0arra
