Qhia tawmcov laser fiber pulsed
Cov laser fiber pulsed yog cov khoom siv tseem ceebcov khoom siv laseruas siv cov fibers doped nrog cov av tsis tshua muaj ions (xws li ytterbium, erbium, thulium, thiab lwm yam) ua qhov nce nruab nrab. Lawv muaj cov khoom nruab nrab nce, lub qhov resonant optical, thiab lub twj tso kua mis. Nws cov thev naus laus zis tsim hluav taws xob feem ntau suav nrog Q-switching thev naus laus zis (nanosecond theem), active mode-locking (picosecond theem), passive mode-locking (femtosecond theem), thiab lub zog oscillation tseem ceeb (MOPA) thev naus laus zis.
Cov ntawv thov kev lag luam suav nrog kev txiav hlau, vuam, ntxuav laser thiab txiav roj teeb lithium TAB hauv thaj chaw tshiab lub zog, nrog rau ntau hom tso zis hluav taws xob mus txog kaum txhiab-watt theem. Hauv thaj chaw ntawm lidar, 1550nm pulsed lasers, nrog lawv lub zog pulse siab thiab cov yam ntxwv muaj kev nyab xeeb rau lub qhov muag, tau siv rau hauv cov kab ke radar thiab cov tsheb mounted.
Cov khoom tseem ceeb suav nrog Q-switched hom, MOPA hom thiab high-power fibercov lasers pulsedPawg:
1. Q-switched fiber laser: Lub hauv paus ntsiab lus ntawm Q-switching yog ntxiv ib lub cuab yeej hloov kho qhov poob hauv lub laser. Hauv feem ntau lub sijhawm, lub laser muaj qhov poob loj thiab yuav luag tsis muaj lub teeb tso zis. Hauv lub sijhawm luv luv heev, kev txo qhov poob ntawm lub cuab yeej ua rau lub laser tso tawm lub zog luv luv heev. Q-switched fiber lasers tuaj yeem ua tiav tau los ntawm kev ua haujlwm lossis kev ua haujlwm tsis siv neeg. Cov thev naus laus zis nquag feem ntau suav nrog kev ntxiv lub zog modulator hauv qhov cavity kom tswj tau qhov poob ntawm lub laser. Cov txheej txheem tsis siv neeg siv cov khoom nqus tau lossis lwm yam teebmeem nonlinear xws li kev txhawb nqa Raman scattering thiab kev txhawb nqa Brillouin scattering los tsim cov txheej txheem Q-modulation. Cov pulses feem ntau tsim los ntawm Q-switching txoj kev yog nyob rau ntawm qib nanosecond. Yog tias cov pulses luv dua yuav tsum tau tsim, nws tuaj yeem ua tiav los ntawm txoj kev hom-locking.
2. Hom-xauv fiber laser: Nws tuaj yeem tsim cov ultrashort pulses los ntawm kev siv hom-locking lossis passive mode-locking methods. Vim yog lub sijhawm teb ntawm lub modulator, qhov dav ntawm pulse tsim los ntawm kev siv hom-locking feem ntau yog nyob rau theem picosecond. Passive mode-locking siv cov khoom siv passive mode-locking, uas muaj lub sijhawm teb luv luv thiab tuaj yeem tsim cov pulses ntawm femtosecond scale.
Nov yog kev qhia luv luv txog lub hauv paus ntsiab lus ntawm kev xauv pwm.
Muaj ntau hom longitudinal hauv lub laser resonant cavity. Rau lub nplhaib-puab cavity, lub sijhawm zaus ntawm cov hom longitudinal yog sib npaug rau /CCL, qhov twg C yog qhov ceev ntawm lub teeb thiab CL yog qhov ntev ntawm txoj kev optical ntawm lub teeb liab mus ncig ib ncig hauv lub cavity. Feem ntau hais lus, qhov nce bandwidth ntawm fiber lasers yog qhov loj heev, thiab ntau tus longitudinal hom ua haujlwm tib lub sijhawm. Tag nrho cov hom uas lub laser tuaj yeem ua raws li nyob ntawm qhov ntev hom ∆ν thiab qhov nce bandwidth ntawm qhov nce nruab nrab. Qhov me dua qhov ntev hom longitudinal, qhov ntau dua qhov nce bandwidth ntawm qhov nruab nrab, thiab ntau hom longitudinal tuaj yeem txhawb nqa. Conversely, qhov tsawg dua.
3. Quasi-continuous laser (QCW laser): Nws yog ib hom kev ua haujlwm tshwj xeeb ntawm cov continuous wave lasers (CW) thiab pulsed lasers. Nws ua tiav cov zis hluav taws xob siab tam sim ntawd los ntawm cov pulses ntev (lub voj voog ua haujlwm feem ntau ≤1%) thaum tswj hwm lub zog nruab nrab qis. Nws ua ke qhov ruaj khov ntawm cov lasers txuas ntxiv nrog qhov zoo ntawm lub zog siab tshaj plaws ntawm cov lasers pulsed.
Txoj cai kev siv tshuab: QCW lasers thauj cov modules modulation hauv qhov txuas ntxiv muslaserlub voj voog los txiav cov lasers txuas ntxiv mus rau hauv cov voj voog ua haujlwm siab, ua tiav kev hloov pauv ntawm cov hom txuas ntxiv mus thiab cov hom pulse. Nws lub ntsiab lus tseem ceeb yog lub tshuab "short-term burst, long-term cooling". Kev txias hauv qhov sib txawv ntawm lub pulse txo cov cua sov sib sau ua ke thiab txo qhov kev pheej hmoo ntawm cov khoom siv thermal deformation.
Cov Zoo thiab Cov Nta: Kev Sib Koom Ua Ke Ob Hom: Nws muab lub zog siab tshaj plaws ntawm hom pulse (txog li 10 npaug ntawm lub zog nruab nrab ntawm hom txuas ntxiv) nrog kev ua haujlwm siab thiab kev ruaj khov ntawm hom txuas ntxiv.
Kev siv hluav taws xob tsawg: Kev hloov pauv hluav taws xob zoo thiab kev siv nyiaj tsawg mus sij hawm ntev.
Beam zoo: Lub beam zoo ntawm fiber lasers txhawb nqa qhov tseeb micro-machining.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-10-2025