简介：TheserviceprovidedbytheGC(GammaCameras)intheNuclearMedicinedepartmentsfailsbecauseoftheirbreakdown,generallyduetotheassociatedelectronicsandnottothephysicaldetectioncomponents.Forthisreason,itwasdecidedtodevelopanelectronicsystemthatallowstherecoveryandoptimizationofdisusedGC,startingwiththedesignofthepreamplifierforaPMT(photomultipliertube).Thecircuitwasdesignedandsimulatedandthelistofcomponentsnecessaryfortheconstructionofthepreamplifierwasgenerated,aswellastheprintedcircuitboardwasdesignedforitsassembly.Bysimulatingthepreamplifierthisworkedinlinearmode.Thisdeterminesthattheamplitudeoftheoutputsignalisproportionaltotheamountofchargedeliveredbythedetector.ThiscardallowsanautomaticadjustmentofthesignalsofthePMTasdothemodernGC.

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简介：Wepresentthedesignandexperimentofabroadbandopticalparametricchirped-pulseamplifier(OPCPA)whichprovideshighconversionefficiencyandgoodbeamqualityat808nmwavelength.Usingathree-dimensionalspatialandtemporalnumericalmodel,severaldesignconsiderationsnecessarytoachievehighconversionefficiency,goodbeamqualityandgoodoutputstabilityarediscussed.Toimprovetheconversionefficiencyandbroadentheamplifiedsignalbandwidthsimultaneously,thenonlinearcrystallengthandOPCPAparametersareanalyzedandoptimizedwiththeconceptofdissipatingamplifiedidlerbetweenopticalparametricamplification(OPA)oftwocrystalsconfiguration.Intheexperiment,anamplifierconsistingoftwoOPCPAstagesof‘L’typeconfigurationwasdemonstratedbyusingtheoptimizedparameters.Anamplifiedsignalenergyof160mJwasachievedwithatotalpump-to-signalefficiencyof35%(43%efficiencyfortheOPCPAstage2).Theoutputbandwidthofsignalpulsereached80nmandthesignalpulsewascompressedto24fs.Theenergystabilityreached1.67%RMSat3%pumpenergyvariation.TheoptimizedOPCPAamplifieroperatesatarepetitionrateof1Hzandisusedasafront-endinjectionforthemainamplifierofSG-II5PWlaserfacility.

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