Optimization of the idler wavelength tunable cascaded optical parametric oscillator based on chirp-assisted aperiodically poled lithium niobate crystal-中国Betway体育网页登陆

摘要 Wepresentthenumericalresultsfortheoptimizationofthepump-to-idlerconversionefficienciesofnanosecondidlerwavelengthtunablecascadedopticalparametricoscillators(OPO)indifferentwavelengthtuningranges,wheretheprimarysignalsfromtheOPOprocessarerecycledtoenhancethepump-to-idlerconversionefficienciesviathesimultaneousdifferencefrequencygeneration(DFG)processbymonolithicaperiodicallypoled,magnesiumoxidedopedlithiumniobate(APMgLN)crystals.TheAPMgLNcrystalsaredesignedwithdifferentchirpparametersfortheDFGprocesstobroadentheirthermalacceptancebandwidthstodifferentextents.TheidlerwavelengthtuningofthecascadedOPOisrealizedbychangingthetemperatureofthedesignedAPMgLNcrystalandthecascadedoscillationisachievedinasinglepumppasssinglyresonantlinearcavity.Thepump-to-idlerconversionefficiencieswithrespecttothepumppulsedurationandratioofOPOcoefficienttoDFGcoefficientarecalculatedbynumericallysolvingthecoupledwaveequations.TheoptimalworkingconditionsofthetunablecascadedOPOspumpedbypulseswithenergiesof350μJand700μJarecomparedtoobtainthegeneralrulesofoptimization.ItisconcludedthattheoptimizationbecomestheinterplaybetweentheratioofOPOcoefficienttoDFGcoefficientandthepumppulsedurationwhentheidlerwavelengthtuningrangeandthepumppulseenergyarefixed.Besides,higherpumppulseenergyisbeneficialforreachinghigheroptimalpump-to-idlerconversionefficiencyaslongastheAPMgLNcrystalisoptimizedaccordingtothispumpcondition.Tothebestofourknowledge,thisisthefirstnumericalanalysisofidlerwavelengthtunablecascadedOPOsbasedonchirp-assistedAPMgLNcrystals.

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Optimization of the idler wavelength tunable cascaded optical parametric oscillator based on chirp-assisted aperiodically poled lithium niobate crystal

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