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1、中文2540字LaserdrivercircuitSmallchangeswilldirectlysemiconductorlaserdrivecurrenttotheoutputintensityfluctuation.Tostabilizetheoutputpowersemiconductorlaser,Voltagenegativefeedbackprincipletodesignaconstantcurrentdrivingcircuitcomprisesasoftstartingandcur
2、rentlimitingprotectioncircuitbasedon;Atthesametime,accordingtotheneedofthelightsourceismodulatedtoeliminatetheinfluenceofbackgroundlightand,integratedlasermodulationcircuitcomprisesacrystaloscillationcircuitanddividercircuitdesign.Makingthespecificcircu
3、itandcompletetherelevantexperimental.Theexperimentalresultsshowthatthecircuitcanprovideadrivingcurrentofhighstability,Currentstabilityupto0.05%;Softstartandcurrent-limitingprotectioncircuitcanprotectthesemiconductorlaserandenhancetheimpactcapability.Mod
4、ulationcircuitgeneratesacarriersignalneededforlaserdiodemodulationanddirecttocompletetheoutputlightmodulation,Theswitchcanbeconvenientlyrealizedfrom256Hzto512kHzrangeof12kindsofcommonlyusedmodulationfrequencyselection.Semiconductorlaserwithitsexcellentc
5、haracteristics,highefficiency,simplestructure,smalliswidelyusedinscientificresearch,nationaldefense,medical,andotherareasofprocessing,itsdrivetechnologybecomesmoreandmoreimportant.Semiconductorlaseristheidealelectron-photondirectconversiondevices,quantu
6、mefficiencyisveryhigh,thecurrentsmallchangeswillleadtoagreatchange,theoutputlightintensityofthetherefore,semiconductorlaserdrivecurrentrequirementsisveryhigh.Drivingtechnologyofsemiconductorlaserusuallyadoptsconstantcurrentdrivemode,thiswork,throughthep
7、rincipleofnegativefeedbackcontrolloop,directlyprovidetheeffectivecontrolofthedrivecurrent.Inaddition,thetransientcurrentorvoltagespikes,andovercurrent,overvoltagewilldamagethesemiconductorlaserdrivecircuit,thereforeshouldbeconsideredintheprotectioncircu
8、itagainstelectricshockmeasuresandspecial.Insomeapplications,DCsemiconductorlasersproduceDCdrivelightinthemeasurementprocessisvulnerabletointerferencefromambientlightslowchange,whichcouldnotbeseparatedfromtheenvironmentlightrequir
