简介：Nitridatedβ-Ga_2O_3(100)substratewasinvestigatedasthesubstrateforGaNepitaxialgrowth.Theeffectsofnitridationtemperatureandsurfaceroughnessofβ-Ga_2O_3wafersontheformationofGaNwerestudied.Itwasfoundthatthemostoptimizednitridationtemperaturewas900°C,andhexagonalGaNwithpreferredorientationwasproducedonthewell-polishedwafer.Thenitridationmechanismwasalsodiscussed.

简介：FourkindsofY2O3stabilizedZrO2(YSZ)thinfilmswithdifferentY2O3contents(from0to12mol%)aredepositedonBK7glasssubstratesbyelectron-beamevaporationmethod.TheeffectsofdifferentY2O3dopantcontentsonresidualstress,structure,andopticalpropertiesofZrO2thinfilmsareinvestigated.TheresultsshowthatresidualstressinYSZthinfilmsvariesfromtensiletocompressivewiththeincreaseofY2O3molarcontent.TheadditionofY2O3isbeneficialtothecrystallizationofYSZthinfilmandtransformationfromamorphoustohightemperaturephase,andtherefractiveindexdecreaseswiththeincreaseofY2O3molarcontent.Moreover,thevariationsofresidualstressandtheshiftsofrefractiveindexcorrespondtotheevolutionofstructuresinducedbytheadditionofY2O3.

简介：Morethan6Waveragepowerultravioletradiationat355nmwasgeneratedinLiB3O5(LBO)crystalthroughthefrequencymixingofthefundamentalandsecondharmonicradiationofaNd:YAGlaser.Thisperformancewasachievedwith38%optical-to-opticalconversionefficiency(532nmto355nm).

简介：Wereportonthecontinuous-wave（CW）andpassiveQ-switchingperformanceofaminiatureYb:Y3Ga5O12crystallaserendpumpedbya935-nmdiodelaser.AmaximumCWoutputpowerof12.03Wisproducedwithanoptical-to-opticalefficiencyof54.4%,whiletheslopeefficiencyis63%.InthepassivelyQ-switchedoperationachievedwithaCr4+:YAGsaturableabsorber,anaverageoutputpowerof2.12Wat1025.2nmisgeneratedwithaslopeefficiencyof46%atapulserepetitionrateof5.0kHz.Thepulse’senergy,duration,andpeakpowerare424μJ,2.3ns,and184.3kW,respectively.

简介：为了解决预制棒直径的增加和拉丝速度的提高所带来的光纤内部应力增大的问题,提出利用退火炉改善光纤内部应力的方法,并且从理论上分析了应用退火工艺改善光纤内部应力的原理。通过对比实验,得到退火工艺对光纤衰减、翘曲特性和光纤脆性的影响。在退火工艺条件下,所制得的光纤在1310、1550nm波长的衰减典型值分别为0.317dB/km、0.182dB/km,翘曲度值在14m以上,光纤的剥纤断纤率降低到0.08%。

简介：为获得可见光波长范围的大角度减反射光学薄膜,采用电子束蒸发斜角蒸镀工艺,按照设计好的膜系,通过蒸镀一系列低折射率膜层,最终得到在380～780nm波长间,入射角0～70°,平均反射率低于1%的光学薄膜。实验结果表明利用斜角蒸镀工艺镀制出折射率从基底到空气的渐变多层膜结构以取得优良的减反射效果是可行的。