Laser diodes yog cov khoom siv semiconductor uas emit coherent lub teeb los ntawm cov txheej txheem ntawm stimuled emission. Kev tsim kho ntawm lub laser diode zoo ib yam li lub teeb-emitting diode (LED), tab sis muaj ntau qhov sib txawv tseem ceeb. Laser diodes muaj ib cheeb tsam active uas yog ua los ntawm ib tug nyias txheej ntawm cov khoom, xws li Gallium Arsenide (GaAs), nrog ib tug siab dua refractive index tshaj lub puag ncig. Lub cheeb tsam no yog sandwiched ntawm ob txheej ntawm p-hom thiab n-hom semiconductors.
01
Lub wavelength
Lub wavelength ntawm lub teeb emitted los ntawm lub laser diode. Rau ib hom kev ntaus ntawv, qhov no yog lub wavelength ntawm ib kab spectral ntawm cov zis laser. Rau ib tug multimode ntaus ntawv, qhov no yog lub wavelength ntawm cov spectral kab nrog qhov loj tshaj kev siv.
02
Tso zis zog
Qhov siab tshaj plaws tso cai tam sim no optical fais fab tso zis hauv kev ua haujlwm tas mus li lossis mem tes.
03
Ua haujlwm tam sim no
Tus nqi ntawm kev xa mus rau tam sim no los ntawm laser diode tsim nyog los tsim cov txheej txheem kho qhov muag tawm ntawm qhov ntsuas kub ua haujlwm.
04
Ua haujlwm voltage
Qhov hluav taws xob rau pem hauv ntej hla lub laser diode thaum lub cuab yeej tsim nws cov lus pom zoo tso tawm ntawm qhov ntsuas kub ua haujlwm.
Thaum ib qho hluav taws xob raug siv thoob plaws pn hlws ris, electrons thiab qhov raug txhaj rau hauv thaj tsam nquag. Cov electrons thiab qhov sib xyaw ua ke los tsim cov khoom siv hluav taws xob-qhov, uas tso tawm lub zog hauv daim ntawv ntawm photons los ntawm cov txheej txheem hu ua spontaneous emission. Txawm li cas los xij, yog tias tsis muaj qhov me me ntawm lub teeb, cov photons tsim tsis sib haum xeeb.
Txhawm rau tsim kom muaj lub teeb ci sib txuas, yuav tsum tsim lub voj kev tawm tswv yim. Qhov no yog ua tiav los ntawm kev ntxiv ob daim iav sib luag rau cov qauv semiconductor, ib qho yog ib feem cuam tshuam. Thaum lub teeb yog tsim nyob rau hauv lub active cheeb tsam, nws bounces ntawm ob daim iav kom txog rau thaum ib tug tej yam pib mus txog, thiab ces cov photons khiav tawm ntawm ib feem ntawm daim iav raws li ib tug coherent beam ntawm lub teeb.
Laser diodes muaj ntau qhov zoo dua li lwm hom lasers. Lawv yog cov compact, npaum, thiab kuj pheej yig los tsim. Lawv kuj tseem tuaj yeem ua haujlwm ntawm kev kub ceev thiab wavelengths, ua rau lawv zoo tagnrho rau kev sib txuas lus thiab kev siv lub suab.
Hauv kev xaus, laser diodes yog cov khoom siv hluav taws xob semiconductor uas tsim cov teeb pom kev zoo los ntawm cov txheej txheem ntawm kev txhawb nqa emission. Lawv tau siv dav hauv ntau daim ntawv thov thiab muaj ntau yam zoo dua lwm hom lasers. Lawv qhov loj me, kev ua tau zoo, thiab tus nqi qis ua rau lawv tshwj xeeb rau kev tsim khoom loj thiab siv hauv cov khoom siv.
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