简介:Differentmaterial-dopedRamanfiberlaserswithveryhighefficiencyoperatingincontinuous-wavearepresented.With1WNd∶YVO4laserpumpingatwavelengthof1342nm,singlemodeoutputpowerofabove500mW(optical-to-opticalconversionefficiencyof50%)issimulatedintherangeof1400-1500nm.Usinghigh-germanium,high-phosphateandhigh-boratesilicatefibersasthegainmedium,laseroutputatwavelengthsof1420,1450,1480and1495nmcanbeachievedwithdifferentgeometries,whicharejustaspumpingC-bandandL-banddistributedRamanfiberamplifiers.
简介:文中设计了一款64点基-4FFT处理器,用改进的CORDIC(MVR-CORDIC)处理单元代替常规FFT处理器中的复数乘法器,改进的CORDIC处理单元在保证SQNR性能下,仅用极少次数的移位加法运算即可完成一次复数乘法,缩减了完成一次基本蝶形运算的时间并减小了面积开销。该FFT处理器结构采用两块独立的RAM,并对中间数据作“乒-乓”式存储操作以节省数据存储时间,从而提高完成一次FFT运算的速度。所设计的FFT处理器通过FPGA进行验证,结果表明平均完成一次64点FFT运算仅需要不到1μs。
简介:Alow-thresholdefficienthigh-repetition-rateeye-safeopticalparametricoscillator(OPO)ispresented.TheOPOisbasedonanx-cutnon-criticallyphase-matched(NCPM)KTAintra-cavitypumpedbyanacousto-optically(A-O)Q-switchedNd:YVO4laser.At10kHz,thelowestthresholdof0.75Wandthesignalpowerof0.6Waregot,correspondingtothesinglepulseenergyof60μJandthepeakpowerof20kW.Tuningthefrequency,themaximumoutputpowerat1536nmis1.03Wat30kHzwithanoptical-to-opticalconversionefficiencyof12.26%.Thefluctuationoftheoutputpoweris2.1%during2hoperation.
简介:Adiode-pumpedacousto-optical(A-O)Q-switchedextra-cavityfrequency-doubledNd:YVO4/KTP(KTiOPO4)greenlaserformedwithasimpleplane-planecavityhasbeendemonstrated.Withtheincidentpumppowerof12.7W,A-OQ-switchedaverageoutputpowerat1064nmwas3.81Wwithadurationof25nsatarepetitionrateof20kHz,extra-cavityfrequencydoublingwithKTPasthenonlinearcrystalyieldedthemaximumoutputpowerof1.92Wat532nm,thecorrespondingopticalconversionefficiencyfrom1064nmto532nmlightis50.4%.Thecontinuous-wave(CW)laserpropertiesofdiodepumpedNd:YVO4crystaloperatingat1064nmhavebeenstudied.Withtheincidentpumppowerof25W,themaximumCWoutputpowerof13.81Wwasobtainedwiththecorrespondingopticalconversionefficiencyof55.24%.