资源描述：
《High-efficiency Bragg gratings in PTR.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、High-efficiencyBragggratingsinphotothermorefractiveglassOlegM.E®mov,LeonidB.Glebov,LarissaN.Glebova,KathleenC.Richardson,andVadimI.SmirnovPhotosensitivesilicateglassesdopedwithsilver,cerium,¯uorine,andbrominewerefabricatedattheCenterforResearchandEducationinOpticsandLasers.Br
2、aggdiffractivegratingswererecordedinthevolumeoftheseglasseswithaphotothermorefractiveprocess~exposuretoUVradiationofaHe±Cdlaserat325nmisfollowedbythermaldevelopmentat520°C!.Absolutediffractionef®ciencyofasmuch21as93%wasobservedfor1-mm-thickgratingswithspatialfrequenciesupto25
3、00mm.Nodecreasingofdiffractionef®ciencywasdetectedatlowspatialfrequencies.Originalglassesweretransparent21~absorptioncoef®cientlessthan1cm!from350to4100nm.Inducedlossesinexposedanddeveloped21glassdecreasedfrom0.3to0.03cmbetween400and700nm,respectively,anddidnotexceed0.01±0.02
4、21cmintheIRregionfrom700to2500nm.Additionallossescausedbyparasiticstructuresrecordedinthephotosensitivemediumwerestudied.©1999OpticalSocietyofAmericaOCIScodes:050.7330,090.2900,160.2750.1.Introductiontransfercharacteristic,highresolution,andlowIncreasingapplicationsforhologra
5、phicopticalele-noise,beinde®nitelyrecyclableorrelativelyinexpen-mentshaveresultedincontinueddevelopmentofsive.Whileseveralmaterialshavebeenstudied,neweffectiveandreliablephotosensitivemedia.nonehasbeenfoundsofarthatmeetsallthesere-TherecentHariharanbook1notesthatthemainpho-qu
6、irements.º1Thelackofavailablematerialsfortosensitivematerialsavailableforhigh-ef®ciencyho-phaseholographystimulatesthesearchfornewap-logramrecordingaresilverhalidephotographicproaches.Inthispaperwedescribepropertiesandemulsions,dichromatedgelatin,photoresists,pho-performanceo
7、fanewinorganicglassasamediumfortopolymers,photothermoplastics,polymerswithhologramrecording,whichmeetspracticallyallthespectralholeburning,andphotorefractivecrystals.requirementsindicatedabove.Eachofthesematerialshastheirmerits,butallhaveUseofinorganicphotosensitiveglassesfor
8、phasedrawbacks.Organicmaterials~photographicemul-hologramrecordingwa
