简介:HighorderBraggscattering(M=2andM=3)operationsofthedistributedfeedbackdyedopedsol-gelsilicalasersareachievedusingthesecondharmonicoutputofaNd:YAGlaserasthepump.Laserlinewidthoflessthan0.06nmandconversionefficiencyof0.7%forM=3and11%forM=2aremeasured.Wavelengthtuningofabout15nmaroundtheemissioncenterhasbeenrealizedbyvaryingtheintersectionangle.
简介:Thefeasibilityoffenestrationoperationinmiddleearbonewithpulsedinfraredlaserisevaluated.HealthymaleNewZealandrabbitsinvivoareusedintheexperiment.Middleearmastoidboneofanimalmodeliscompletelyexposedwithconventionalmethods,andthenapulsedCO2laser(10.6μm)andanEr:YAGlaser(2.94μm)areusedtoperformthefenestrationoperation.Diamonddrillisalsousedasacontrolgroup.Thetotaloperationtimeandlightirradiationtimearerecordedandtheopeningefficiencyisassessed.Themorphologicalchangesandthermaldamagearoundtheopeningwindowonthemiddleearboneareexamined.Itisshownthatbothlasersystemsaresuitableforthefenestrationoperationinmiddleearbone,andthisno-touchtechniquehasalotofbenefitscomparedwithtraditionalmethods.Thebleedingduringoperationhasanimportanteffectonoperationtimeandthermalinjuryandneedstobecontrolledefficientlyinfurtherstudy.更多还原