简介:Superluminescencediode(SLD)moduleswithwidespectrumcharacteristicsarerequiredinfibergyroscopes.A1.3μmbutterflypackagedsuperluminescencediodewiththespectrumwidthover30nmisreportedandrecentadvancesinprocessofSLDisdescribedinthepaper.TheSLDmoduleshavebeenappliedtofibergyroscopes.
简介:Asimpleandeffectivegreedyalgorithmforimageapproximationisproposed.Basedonthematchingpursuitapproach,itischaracterizedbyareducedcomputationalcomplexitybenefitingfromtwomajormodifications.First,ititerativelyfindsanapproximationbyselectingMatomsinsteadofoneatatime.Second,theinnerproductcomputationsareconfinedwithinonlyafractionofdictionaryatomsateachiteration.Themodificationsareimplementedveryefficientlyduetothespatialincoherenceofthedictionary.Experimentalresultsshowthatcomparedwithfullsearchmatchingpursuit,theproposedalgorithmachievesaspeed-upgainof14.4~36.7timeswhilemaintainingtheapproximationquality.
简介:Areviewontheprogressofpowerful2μmsilicafibersourcesinpastdecadesispresented.Wereviewthestate-of-the-artrecordsandrepresentativeachievementsof2μmhigh-average-powercontinuouswave,pulsedfiberlasersandamplifiers,andpowerfulsuperfluorescentsources.Challengeswhichlimitthefurtherpowerscalingof2μmsilicafibersourcesarediscussed,includingpumpingbrightnesslimitation,thermalproblem,andnonlineareffects.Potentialandpromisingroadmapstogobeyondtheselimitations,liketandempumpingandbeamcombining,arediscussed.Prospectsofpowerful2μmsilicafibersourcesarealsopresentedintheendofpaper.
简介:Self-organizedIn0.5Ga0.5As/GaAsquantumislandstructureemittingat1.35μmatroomtemperaturehasbeensuccessfullyfabricatedbymolecularbeamepitaxy(MBE)viacycled(InAs)1/(GaAs)1monolayerdepositionmethod.Photoluminescence(PL)measurementshowsthatverynarrowPLlinewidthof19.2meVat300Khasbeenreachedforthefirsttime,indicatingeffectivesuppressionofinhomogeneousbroadeningofopticalemissionfromtheIn0.5Ga0.5Asislandsstructure.Ourresultsprovideimportantinformationforoptimizingtheepitaxialstructuresof1.3μmwavelengthquantumdot(QD)devices.
简介:Inrecentyears,thepotentialofrenewablegreenenergysourceshasbeenextensivelystudied.Theproventechnologywhichisphotovoltaicsolarcellsstrictlydependsondaylightandproduceslow-efficiently.Toovercometherestrictions,onetechnologystudiedisthroughharvestingthethermalradiationenergywhichcanprovidea24-hourenergysource.Thecontinuityofenergysourcespromisesverygoodenergyconversionespeciallyformilitaryapplications.Thisarticlepresentsanewstructurethatcanharvesttheabundantthermalradiationenergyintousableenergyatthewavelengthof10μm.Arectangularstructurewithaperturbationslitwasdesignedtointegratewitharectifiercircuitforgreenenergyconversion.Theslittunneljunctionguidedtheelectromagneticfieldintoajunctionwheretheenergycouldbecollectedandconverted.Anenhancementfactorofapproximately110.6canbeachievedbyaperturbationslitlengthof1.0μm.Theresultsextractedfromtheproposeddesignpromiseabettercandidatetoovercomethedisadvantagesofphotovoltaicsolarcellsforenergyharvestingdevices.