Dab tsi yog anqaim linewidth laser?
Nqaim linewidth laser, lo lus "kab dav" yog hais txog kab spectral dav ntawm lublasernyob rau hauv lub zaus sau, uas feem ntau yog quantified nyob rau hauv cov nqe lus ntawm ib nrab-ncej tag nrho cov dav ntawm lub spectrum (FWHM). Lub linewidth feem ntau cuam tshuam los ntawm cov hluav taws xob tshwm sim ntawm cov atoms lossis ions, theem suab nrov, kev vibration ntawm lub resonator, kub jitter thiab lwm yam sab nraud. Qhov me dua tus nqi ntawm txoj kab dav, qhov siab dua qhov purity ntawm lub spectrum, uas yog, qhov zoo dua qhov monochromaticity ntawm lub laser. Lasers nrog cov yam ntxwv zoo li no feem ntau muaj me ntsis theem lossis lub suab nrov nrov thiab cov suab nrov ntawm cov txheeb ze tsawg heev. Nyob rau tib lub sijhawm, qhov me me ntawm cov kab dav dav ntawm lub laser, qhov muaj zog dua qhov sib txuam, uas yog manifested raws li qhov ntev coherence ntev heev.
Realization thiab daim ntawv thov ntawm nqaim linewidth laser
Txwv tsis pub los ntawm qhov kev nce hauv linewidth ntawm cov khoom ua haujlwm ntawm lub laser, nws yuav luag tsis yooj yim sua kom paub ncaj qha cov zis ntawm nqaim linewidth laser los ntawm kev cia siab rau cov tsoos oscillator nws tus kheej. Txhawm rau kom paub txog kev ua haujlwm ntawm nqaim linewidth laser, feem ntau nws yog qhov yuav tsum tau siv cov ntxaij lim dej, grating thiab lwm yam khoom siv los txwv lossis xaiv cov longitudinal modulus hauv qhov nce spectrum, ua kom cov net nce qhov sib txawv ntawm cov longitudinal hom, yog li ntawd muaj ob peb los yog tsuas yog ib tug longitudinal hom oscillation nyob rau hauv lub laser resonator. Nyob rau hauv cov txheej txheem no, nws yog ib qho tsim nyog los tswj cov suab nrov ntawm lub laser tso zis, thiab txo qhov kev nthuav dav ntawm cov kab spectral tshwm sim los ntawm kev vibration thiab kub hloov ntawm qhov chaw sab nraud; Nyob rau tib lub sijhawm, nws tseem tuaj yeem ua ke nrog kev tsom xam ntawm theem lossis zaus lub suab nrov spectral ceev kom nkag siab lub hauv paus ntawm lub suab nrov thiab ua kom zoo tshaj qhov tsim ntawm lub laser, thiaj li ua tiav cov txiaj ntsig ruaj khov ntawm qhov nqaim linewidth laser.
Cia peb saib ntawm qhov kev ua tiav ntawm txoj haujlwm nqaim ntawm ntau pawg ntawm lasers.
Semiconductor lasers muaj qhov zoo ntawm qhov loj me, kev ua haujlwm siab, lub neej ntev thiab cov txiaj ntsig kev lag luam.
Fabry-Perot (FP) optical resonator siv nyob rau hauv ib txwmsemiconductor lasersfeem ntau oscillates nyob rau hauv multi-longitudinal hom, thiab cov zis kab dav dav yog qhov dav, yog li nws yog ib qho tsim nyog yuav tsum tau ua kom cov kev tawm tswv yim kho qhov muag kom tau txais cov zis ntawm txoj kab nqaim dav.
Distributed tawm tswv yim (DFB Laser) thiab Distributed Bragg reflection (DBR) yog ob qho tib si sab hauv kho qhov muag tawm tswv yim semiconductor lasers. Vim lub me me grating pitch thiab zoo wavelength selectivity, nws yog ib qho yooj yim mus cuag ruaj khov ib zaus nqaim linewidth tso zis. Qhov sib txawv tseem ceeb ntawm ob lub qauv yog txoj hauj lwm ntawm lub grating: DFB Laser qauv feem ntau faib cov qauv ntawm Bragg grating thoob plaws hauv lub resonator, thiab lub resonator ntawm DBR feem ntau yog tsim los ntawm cov kev xav grating qauv thiab qhov nce cheeb tsam kev koom ua ke rau hauv qhov kawg nto. Tsis tas li ntawd, DFB lasers siv embedded gratings nrog tsawg refractive index contrast thiab tsawg reflectivity. DBR lasers siv nto gratings nrog siab refractive index contrast thiab siab reflectivity. Ob lub qauv muaj qhov loj dawb spectral ntau yam thiab tuaj yeem ua qhov wavelength tuning yam tsis muaj hom dhia hauv qhov ntau ntawm ob peb nanometers, qhov twg DBR laser muaj ntau qhov kev sib tw ntau dua.DFB laser. Tsis tas li ntawd, sab nraud kab noj hniav kho qhov muag tawm tswv yim thev naus laus zis, uas siv cov khoom siv kho qhov muag sab nraud los tawm tswv yim lub teeb tawm ntawm semiconductor laser nti thiab xaiv qhov zaus, kuj tuaj yeem paub qhov nqaim linewidth ua haujlwm ntawm semiconductor laser.
(2) Fiber lasers
Fiber lasers muaj lub twj tso kua mis hloov dua siab tshiab efficiency, zoo beam zoo thiab siab coupling efficiency, uas yog cov kub kev tshawb fawb cov ntsiab lus nyob rau hauv lub laser teb. Nyob rau hauv cov ntsiab lus ntawm cov ntaub ntawv hnub nyoog, fiber ntau lasers muaj zoo compatibility nrog tam sim no optical fiber kev sib txuas lus systems nyob rau hauv kev ua lag luam. Ib leeg-zaus fiber ntau laser nrog qhov zoo ntawm txoj kab nqaim dav, tsis tshua muaj suab nrov thiab zoo sib xws tau dhau los ua ib qho ntawm cov lus qhia tseem ceeb ntawm nws txoj kev loj hlob.
Tib hom kev ua haujlwm ntev ntev yog lub hauv paus ntawm fiber ntau laser kom ua tiav cov kab dav dav, feem ntau raws li cov qauv ntawm cov resonator ntawm ib zaus fiber ntau laser yuav muab faib ua DFB hom, DBR hom thiab lub nplhaib hom. Ntawm lawv, txoj hauv kev ua haujlwm ntawm DFB Laser thiab DBR ib zaug fiber ntau lasers zoo ib yam li DFB thiab DBR semiconductor lasers.
Nyob rau hauv 1960, lub ntiaj teb thawj ruby laser yog ib tug solid-state laser, tus yam ntxwv los ntawm lub siab tso zis zog thiab ib tug dav wavelength kev pab them nqi. Qhov tshwj xeeb spatial qauv ntawm solid-state laser ua rau nws yooj yim dua nyob rau hauv tus tsim ntawm nqaim linewidth tso zis. Tam sim no, cov kev siv tseem ceeb suav nrog txoj kab noj hniav luv luv, ib txoj kev nplhaib kab noj hniav, txoj hauv kev intracavity, torsion pendulum hom kab noj hniav txoj kev, ntim Bragg grating txoj kev thiab cov noob txhaj tshuaj.
Post lub sij hawm: Jun-03-2025