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简介：Vanadiumalloys,especiallythatofV4Cr4Ti,aresupposedasthepromisingcandidatestructuralmaterialforfusionapplicationsfortheirgoodthermalproperties,hightemperaturestrengthandtheinherentlowactivationcharacteristics.However,inrecent

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简介：Inthecontextoftopcolor-assistedtechnicolor(TC2)model,westudythechargedandneutraltop-pionsproductionprocessγγ→W~+П_t~-П_t~0.Wefindthattheproductioncrosssectionislargerthanthatoftheprocessγγ→W~+H~-Hintheminimalsupersymmetricstandardmodel.WithreasonablevaluesoftheparametersintheTC2model,thecrosssectioncanreachthelevelofafewfb.Furthermore,theflavor-changing(FC)decaymodeП_t~0→tcisthebestchanneltodetecttheneutraltop-pionduetothecleanSMbackground.Withalargenumberofeventsandthecleanbackground,theneutraltop-pionshouldbeobservableatfuturelinearcollidersoperatinginγγmodeattheTeVenergyscale.

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简介：WesuggesttwoschemestogeneratetheWstateofNA-typethree-levelatoms.Intheschemes,identicalNthree-levelatomsaretrappedinacavityorNdistantcavities.ThesuccessorfailureofthegenerationoftheWstatecanbedeterminedbydetectingthepolarizationofphotonleakingoutofthecavity.TheresultdemonstratesthattheWstateisfreefromboththecavitylossandthespontaneousemissionduetothefactthatthetwogroundstates(leftandright)ofthethree-levelatomsarestablestates(ormetastablestates).

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简介：WedemonstrateamonolithicsinglefrequencyTm-dopedfiberamplifierwithoutputpowerof51.5W.Asinglefrequencyfiberlaserat1.97μmisamplifiedbyacascadedmasteroscillatorpoweramplifier(MOPA)systemwithall-fiberconfiguration.Theoptical-to-opticalconversionefficiencyofthemainfiberamplifieris45%.Noamplifiedspontaneousemission(ASE)orstimulatedBrillouinscattering(SBS)effectisobservedinthefiberamplifier.Theoutputpowercouldbefurtherscaledbylaunchingmorepumppower.