简介:一个广泛地集成的40G-ROF和10-Gb/sWDM-PON多服务存取系统被建议并且试验性地示威了。这个计划由同时播送无线的独立2.5-Gb/s和10-Gb/s电线信号的40G-ROF和10-Gb/sWDM-PON的一个综合系统组成。在基础车站,它采用调整在DPSK下游的信号上策划在上游的OOK信号,它被remodulating完成,到减少基础车站的费用。传播实验在25-km-long单身者模式纤维(SMF-28)上被执行。下游的PON和ROF的敏感表明的结果表演是[?]14.5dBm并且[?]21.5dBm,分别地并且在上游的信号的敏感是[?]25.3dBm。[从作者抽象]
简介:Twotransmissioncurvedcrystalspectrometersaredesignedtomeasurethehardx-rayemissioninthelaserfusionexperimentofComptonradiographyofimplosiontargetonShenGuang-IIIlaserfacilityinChina.Cylindricallycurvedα-quartz(10–11)crystalswithcurvatureradiiof150and300mmareusedtocoverspectralrangesof10–56and17–100keV,respectively.Thedistancebetweenthecrystalandthex-raysourcecanbechangedoverabroaddistancefrom200to1500mm.Theopticaldesign,includingtheintegralreflectivityofthecurvedcrystal,thesensitivity,andthespectralresolutionofthespectrometers,isdiscussed.WealsoprovidemechanicdesigndetailsandexperimentalresultsusingaMoanodex-raysource.High-qualityspectrawereobtained.Weconfirmedthatthespectralresolutioncanbeimprovedbyincreasingtheworkingdistance,whichisthedistancebetweentherecordingmediumandtheRowlandcircle.
简介:TheaveragepoweroffiberlasershasbeenscaleddeeplyintothekWregimeinthepastyears.However,stimulatedRamanscattering(SRS)isstillamajorfactorlimitingfurtherpowerscaling.Here,wehavedemonstratedforthefirsttime,tothebestofourknowledge,thesuppressionofSRSinahalf10kWtandempumpingfiberamplifierusingchirpedandtiltedfiberBragggratings(CTFBGs).Withspeciallyself-designedandmanufacturedCTFBGsinsertedbetweentheseedlaserandtheamplifierstage,amaximumSRSsuppressionratioof>15dBinspectrumisobservedwithnoreductioninlaserefficiency.WithoneCTFBG,theeffectiveoutputpowerisimprovedto3.9kWwithabeamqualityM2factorof~1.7from<3.5kWwithanM2factorof>2;withtwoCTFBGs,theeffectivelaserpowerreaches4.2kWwithanincreasingratioof20%andanM2factorof~1.8,andfurtherpowerimprovementislimitedbythepowerandperformanceofthe1018nmpumpsources.ThisworkprovidesaneffectiveSRSsuppressionmethodforhigh-powerall-fiberlasers,whichisusefulforfurtherpowerscalingofthesesystems.
简介:ThecompressionbehaviourofPd39Ni10Cu30P21bulkmetallicglassisivestigatedatroomtemperatureupto23.5GPausinginsituhighpressureenergydispersivex-raydiffractionwithasynchrotronradiationsource.Pressureinducedstrucuralrelaxationofthebulkmetallicglassisexhibitedwithinthepressurerange.Itisfoundthatbelowabout5GPa,theexistenceofexcessfreevolumecontributestorapidstructuralrelaxation,whichgivesrisetorapidvolumeticchange.Underhigherpressure,furtherrelaxationresultsinstructuralstiffness.