简介：Usingmoleculardynamics(MD)methodscombiningwithtwo-stepradiationheatingmodel,themechanismsofablationandthethermodynamicstatesatNisurfaceunderfemtosecondlaserirradiationareinvestigated.Simulationresultsshowthatthemainmechanismsofablationareevaporationandtensilestressesgeneratedinsidethetarget.Thevelocityofstresswaveispredictedtobenearlyequaltosoundvelocity.Theratesofablationatdifferentfluencesobtainedfromsimulationsareingoodagreementwithexperimentaldata.Superheatingphenomenonisalsodiscovered.

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简介：Weobserveanonlinearresponseofadual-wavelengthNd:YAGlaserwhensubjectedtolow-frequencyperiodicmodulationsofcavitylosses.Themodulationfrequencyisfarfromtherelaxationoscillationfrequency.Theharmonicresonancesofthetwolaserwavelengthsassociatedwithantiphaseintensityoscillationsaredemonstratedandresonancesuptothefourthorderwereobserved.Forrelativelyweakmodulation,theintensityoscillationfrequencyofthelaserisequaltothemodulationfrequency.Harmonicresonancesoccurunderastrongermodulation.Wefindthatmoreharmoniccomponentsappearwhenthemodulationfrequencyisincreased.Furthermore,withenhancingthemodulation,thedominantfrequencyoftheintensityoscillationsofbothwavelengthsisshiftedtowardthehigher-orderharmonicfrequency.更多还原

简介：Ultrashortpulsesweregeneratedinpassivelymode-lockedNd:YAGandNd:GdVO4laserspumpedbyapulsedlaserdiodewith10-Hzrepetitionrate.Stablemode-lockedpulsetrainswereproducedwiththepulsewidthof10ps.Theevolutionofthemode-lockedpulsewasobservedintheexperimentandwasdiscussedindetail.ComparingthepulseevolutionsofNd:YAGandNd:GdVO4lasers,wefoundthatthebuilduptimeofthesteady-statemode-lockingwithsemiconductorsaturableabsorbermirrors(SESAMs)wasrelevanttotheupper-statelifetimeandtheemissioncross-sectionofthegainmedium.