简介:奥迪|A3年龄|30职业|大客户经理开车习惯|完全老年化升法,绝不超限速车辆型号|奥迪A3购买日期|2015年8月成交价格|22.8万元行驶里程|36000公里油耗|11.7升/百公里UPS:高颜值,和我一样……DOWNS:比较费油M:KK你好,看你还很年轻,当时怎么会想到选三厢的A3呢?
简介:Theeffectofλ/2SiO2overcoatonthelaserdamagecharacteristicsofHfO2/SiO2high-reflector(HR)coatingsisinvestigatedwith1-on-1andN-on-1laserdamagetestmethods.Thelaserdamagesurfaceof1-on-1isanalyzedbyastepanalyzer.ThesurfacemorphologiesshowthatlaserdamagemakesthecoatingdamagedareaprotrudentandroughforHRcoatingwithoutλ/2silicaovercoat,butconcaveandsmoothforHRcoatingwithλ/2silicaovercoat.Theresultof10-on-1multi-pulseirradiationonthesamepointofthecoatingshowsthatthereisanenergydensitystageonthedamagecurve.Ifthelaserenergydensityiswithintherangeofthestage,HfO2/SiO2HRcoatingswithλ/2silicaovercoatwillnotbedamagedmorethan2timesformulti-shots,andthesurfacedamagesareveryslightsothatthereisnoimpactonthecoatingperformance.Anotherinterestingresultisthattheenergydensitystageextendsfromthedamagethresholdtothepointofabout3timesofthreshold,whichissimilartotheeffectofthelaserconditiononcoating.
简介:Thenormalspectralemissivityofniobiumstripspecimenismeasuredusinganewpulse-heatingreflectometrictechnique.Thehemisphericalspectralreflectivityofthesurfaceofastriptangenttoanintegratingsphereisdeterminedbyahigh-speedlock-intechnique.Atthesametime,theradiancetem-peratureofthestripismeasuredbythemulti-wavelengthhigh-speedpyrometerfromapproximately1000Ktothemeltingpoint.Detailsofthemeasurementmethodandoftherelatedcalibrationtechniquesarereported.Resultsofthenormalspectralemissivityofniobiumat633,753,827,and905nmfromroomtemperaturetoitsmeltingpointarepresented.Theaccuracyofspectralemissivitiesisestimatedbetterthan5%.
简介:Thenonlinearswitchingcharacteristicsoffusedfiberdirectionalcouplerswerestudiedexperimentally.Byusingfemtosecondlaserpulseswithpulsewidthof100fsandwavelengthofabout1550nmfromasystemofTi:sapphirelaserandopticalparametricamplifier(OPA),thenonlinearswitchingpropertiesofanullcoupleranda100%couplerweremeasured.Theexperimentalresultswerecoincidentwiththesimulationsbasedonnonlinearpropagationequationsinfiberbyusingsuper-modetheory.Nonlinearlossinfiberwasalsomeasuredtogettheinjectedpoweratthecoupler.Afterdeductingthenonlinearlossandinputefficiency,thenonlinearswitchingcriticalpeakpowersfora100%andanullfusedcouplerswerecalculatedtobe9410and9440W,respectively.ThenonlinearlossparameterPNinanexpressionofαNL=αP/PNwasobtainedtobePN=0.23W.