Ua ntej, Internal modulation thiab sab nraud modulation
Raws li tus txheeb ze kev sib raug zoo ntawm lub modulator thiab lub laser, lublaser modulationtuaj yeem muab faib ua internal modulation thiab sab nraud modulation.
01 Internal modulation
Lub teeb liab modulation yog nqa tawm nyob rau hauv cov txheej txheem ntawm laser oscillation, uas yog, tsis muaj laser oscillation yog hloov raws li txoj cai ntawm lub modulation teeb liab, thiaj li mus hloov cov yam ntxwv ntawm lub laser tso zis thiab ua tiav modulation.
(1) Ncaj qha tswj lub laser twj tso kua mis qhov chaw kom ua tiav qhov kev hloov kho ntawm cov zis laser siv thiab seb puas muaj, yog li ntawd nws yog tswj los ntawm lub hwj chim mov.
(2) Lub caij hloov pauv tau muab tso rau hauv lub resonator, thiab kev hloov pauv ntawm lub cev yam ntxwv ntawm cov qauv kev hloov pauv yog tswj los ntawm lub teeb liab los hloov qhov tsis sib xws ntawm lub resonator, yog li hloov cov yam ntxwv ntawm lub laser.
02 Sab nraud modulation
Sab nrauv modulation yog kev sib cais ntawm laser tiam thiab kev hloov kho. Hais txog kev thauj khoom ntawm lub teeb liab modulated tom qab tsim lub laser, uas yog, lub modulator tau muab tso rau hauv txoj kev kho qhov muag sab nraum lub laser resonator.
Modulation teeb liab voltage ntxiv rau lub modulator ua rau ib co lub cev yam ntxwv ntawm lub modulator theem hloov, thiab thaum lub laser dhau los ntawm nws, ib co tsis ntawm lub teeb yoj yog modulated, yog li nqa cov ntaub ntawv mus rau kis. Yog li ntawd, kev hloov kho sab nraud tsis yog hloov pauv cov laser tsis, tab sis hloov qhov tsis muaj qhov tso zis laser, xws li kev siv zog, zaus, thiab lwm yam.
Thib ob,laser modulatorkev faib tawm
Raws li kev ua haujlwm mechanism ntawm lub modulator, nws tuaj yeem muab faib uaelectro-optic modulation, acoustooptic modulation, magneto-optic modulation thiab direct modulation.
01 Direct modulation
Kev tsav tsheb tam sim no ntawmsemiconductor laserlos yog lub teeb-emitting diode yog modulated ncaj qha los ntawm lub teeb liab hluav taws xob, thiaj li hais tias lub teeb tso zis yog modulated nrog kev hloov ntawm lub teeb liab hluav taws xob.
(1) TTL kev hloov pauv hauv kev hloov pauv ncaj qha
Lub TTL cov teeb liab tau ntxiv rau lub laser fais fab mov, kom lub laser tsav tam sim no tuaj yeem tswj tau los ntawm cov teeb liab sab nraud, thiab tom qab ntawd lub laser tso zis zaus tuaj yeem tswj tau.
(2) Analog modulation nyob rau hauv ncaj qha modulation
Ntxiv rau lub laser fais fab mov analog teeb liab (amplitude tsawg dua 5V arbitrary hloov teeb liab yoj), tuaj yeem ua rau cov teeb liab sab nraud tawm tswv yim sib txawv voltage sib xws rau laser sib txawv tsav tam sim no, thiab tom qab ntawd tswj cov zis laser zog.
02 Electro-optic modulation
Modulation siv cov nyhuv electro-optic hu ua electro-optic modulation. Lub hauv paus ntawm lub cev ntawm electro-optic modulation yog cov nyhuv electro-optic, uas yog, nyob rau hauv qhov kev txiav txim ntawm ib daim ntawv thov hluav taws xob, lub refractive index ntawm ib co crystals yuav hloov, thiab thaum lub teeb yoj dhau los ntawm qhov nruab nrab, nws kis tau tus yam ntxwv. raug cuam tshuam thiab hloov.
03 Acousto-optic modulation
Lub hauv paus ntawm lub cev ntawm acousto-optic modulation yog cov nyhuv acousto-optic, uas yog hais txog qhov tshwm sim uas lub teeb nthwv dej yog diffused los yog tawg los ntawm lub supernatural yoj teb thaum propagating nyob rau hauv nruab nrab. Thaum lub refractive Performance index ntawm nruab nrab hloov ib ntus los ua ib tug refractive index grating, diffraction yuav tshwm sim thaum lub teeb yoj propagates nyob rau hauv nruab nrab, thiab qhov siv, zaus thiab kev taw qhia ntawm lub diffractive teeb yuav hloov nrog kev hloov ntawm lub supergenerated yoj teb.
Acousto-optic modulation yog txheej txheem lub cev uas siv cov nyhuv acousto-optic los thauj cov ntaub ntawv ntawm cov khoom siv kho qhov muag. Lub teeb liab modulated yog ua los ntawm electro-acoustic transducer nyob rau hauv daim ntawv ntawm hluav taws xob teeb liab (amplitude modulation), thiab cov hluav taws xob sib txuas teeb liab yog hloov dua siab tshiab rau hauv ultrasonic teb. Thaum lub teeb nthwv dej dhau los ntawm qhov nruab nrab acousto-optic, cov khoom siv kho qhov muag tau hloov kho thiab dhau los ua ib qho kev siv zog modulated nthwv dej uas "nqa" cov ntaub ntawv.
04 Magneto-optical modulation
Magneto-optic modulation yog ib daim ntawv thov ntawm Faraday lub electromagnetic optical rotation nyhuv. Thaum lub teeb nthwv dej nthuav tawm los ntawm magneto-optical nruab nrab thaum uas tig mus rau cov kev taw qhia ntawm magnetic teb, qhov tshwm sim ntawm kev sib hloov ntawm lub dav hlau polarization ntawm linearly polarized lub teeb yog hu ua magnetic rotation.
Ib qhov chaw sib nqus tas li yog siv rau qhov nruab nrab kom ua tiav cov hlau nplaum saturation. Kev taw qhia ntawm Circuit Court magnetic teb yog nyob rau hauv axial kev taw qhia ntawm qhov nruab nrab, thiab Faraday rotation nyob ntawm axial tam sim no magnetic teb. Yog li ntawd, los ntawm kev tswj cov tam sim no ntawm high-frequency coil thiab hloov lub magnetic teb lub zog ntawm lub axial teeb liab, lub rotating lub kaum sab xis ntawm lub optical vibration dav hlau yuav tswj tau, thiaj li hais tias lub teeb amplitude los ntawm lub polarizer hloov nrog kev hloov ntawm θ Lub kaum sab xis. , yog li mus cuag modulation.
Post lub sij hawm: Jan-08-2024