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1、中文2540字LaserdrivercircuitSmallchangeswilldirectlysemiconductorlaserdrivecurrenttotheoutputintensityfluctuation.Tostabilizetheoutputpowersemiconductorlaser,Voltagenegativefeedbackprincipletodesignaconstantcurrentdrivingcircuitcomprisesasoftstartingandcurrentlimitingprotectioncirc
2、uitbasedon;Atthesametime,accordingtotheneedofthelightsourceismodulatedtoeliminatetheinfluenceofbackgroundlightand,integratedlasermodulationcircuitcomprisesacrystaloscillationcircuitanddividercircuitdesign.Makingthespecificcircuitandcompletetherelevantexperimental.Theexperimental
3、resultsshowthatthecircuitcanprovideadrivingcurrentofhighstability,Currentstabilityupto0.05%;Softstartandcurrent-limitingprotectioncircuitcanprotectthesemiconductorlaserandenhancetheimpactcapability.Modulationcircuitgeneratesacarriersignalneededforlaserdiodemodulationanddirecttoc
4、ompletetheoutputlightmodulation,Theswitchcanbeconvenientlyrealizedfrom256Hzto512kHzrangeof12kindsofcommonlyusedmodulationfrequencyselection.Semiconductorlaserwithitsexcellentcharacteristics,highefficiency,simplestructure,smalliswidelyusedinscientificresearch,nationaldefense,medi
5、cal,andotherareasofprocessing,itsdrivetechnologybecomesmoreandmoreimportant.Semiconductorlaseristheidealelectron-photondirectconversiondevices,quantumefficiencyisveryhigh,thecurrentsmallchangeswillleadtoagreatchange,theoutputlightintensityofthetherefore,semiconductorlaserdrivecu
6、rrentrequirementsisveryhigh.Drivingtechnologyofsemiconductorlaserusuallyadoptsconstantcurrentdrivemode,thiswork,throughtheprincipleofnegativefeedbackcontrolloop,directlyprovidetheeffectivecontrolofthedrivecurrent.Inaddition,thetransientcurrentorvoltagespikes,andovercurrent,overv
7、oltagewilldamagethesemiconductorlaserdrivecircuit,thereforeshouldbeconsideredintheprotectioncircuitagainstelectricshockmeasuresandspecial.Insomeapplications,DCsemiconductorlasersproduceDCdrivelightinthemeasurementprocessisvulnerabletointerferencefromambientlightslowchange,whichc
8、ouldnotbeseparatedfromtheenvironmentlightrequir
