简介：EnergystorageandheatdepositioninCr,Yb,Erco-dopedphosphateglasswerereported.Amodelbasedonrateequationswasusedtodeterminetheenergystoragefromthefree-oscillatingoutputenergycharacteristics.Theheatdepositionwascalculatedbymeasuringthetemperatureriseoftheglassrod.TheresultsprovidedimportantinformationfortheglassoperatinginQ-switchedmode,andalsoforcalculatingthetemperatureprofilesandcoolingrequirementsoftheglassundersingleshotandrepetitivepulsedconditions.

简介：选用高功率脉冲TEACO2激光器,对不同颜色不同种类的油漆进行了清洗实验,运用数码照片分析程序计算出清洁率,找出了完全清洗阈值和损伤阈值.实验结果较为清晰地给出了激光输出能量和重复频率对清洗效果的影响.对红色醇酸漆来说,完全清洗阈值为10.37J/cm^2,而损伤阈值为11.43J/cm^2;红色金属喷漆的完全清洗阈值为9.66J/cm^2,其损伤阈值达10.37J/cm^2;黄色金属喷漆的完全清洗阈值为10.71J/cm^2,损伤阈值则为11.07J/cm^2.输出能量和重复频率未达指定参数时,激光清洗清洁率则低于100%.

简介：Becausepulserepetitionrateaffecteddirectlythemomentumcouplingcoefficientoftransverselyexcitedatmospheric(TEA)CO2laserpropulsion,adoublepulsetrigger,controllinghighvoltageswitchoflaserexcitationcircuit,wasdesigned.Thepulseintervalrangedbetween5and100ms.Themomentumcouplingcoefficientforair-breathingmodelaserpropulsionwasstudiedexperimentally.Itwasfoundthatthemomentumcouplingcoefficientdecreasedwiththepulserepetitionrateincreasing.

简介：Twosilicahostmagnesium(Mg)-aluminum(Al)-germanium(Ge)co-dopederbium-dopedfibers(EDFs)havebeenfabricated,whichhavedifferentMgconcentrations.Theconcentrationofallthecompositionsinthepreformismeasuredthroughelectronicsprobemicroanalysis(EPMA).ThemaximumMgconcentrationsoffibersAandBare3.98and1.28mol%,respectively.Theperformancecharacteristicsincludingabsorptionspectrumandgainaremeasuredandanalyzed.TheabsorptioncoefficientsoffibersAandBare13.3and14.3dB/mrespectivelyatwavelengthof1532nm.Themaxgainsofthesetwoerbium-dopedfiberamplifiers(EDFAs)are30.1and35.9dBwithinputsignalpowerof-30dBmandpumppowerof100mWat980nm.FiberBwithmaximumMgconcentration1.28mol%hasbetterperformancethanfiberA.FiberBhashighabsorptioncoefficientandhighgaincharacteristics.TheoptimumfiberBlengthofC-bandEDFAis7mandthatofL-BandEDFAisabout30m,whichismuchshorterthanstandardcommercialEDFAs.TheresultofexperimentsshowedthatafewMgaddedtosilicahostEDFcanincreasetheconcentrationoferbiumions,whichwillshortentheEDFlengthmuch,butnotdegradetheperformancecharacteristics.