Dab tsi yog Lub Hwjchim Loj Xiav Semiconductor Lasers?

CovBrightness thiab High Power Blue Semiconductor Laserstau txhim kho tas li mus rau cov kev txwv tshiab, uas tseem yuav ua rau kev siv ntau dua thiab dav dua. Ntxiv nrog rau cov khoom siv hlau ua tau zoo, xiav semiconductor lasers cia siab tias yuav siv cov ntawv hla tebchaws, tshwj xeeb tshaj yog cov tshuab engineering yuav ua rau cov khoom siv laser ua nrog lub teeb xiav hauv qab dej. Rau kev tsim khoom, qhov no yog qhov zoo tshaj plaws. Tsis tas li ntawd, kev lag luam teeb pom kev zoo kuj tuaj yeem siv cov cuab yeej siv hluav taws xob zoo raws li xiav semiconductor lasers.

1. Kev txwv ntawm high-power lasers nyob ze-infrared wavelengths

Tau ntau xyoo dhau los, lub zog siab CW lasers tau dhau los ua cov cuab yeej siv niaj hnub no, suav nrog cov ntawv thov xws li vuam, cladding, kev kho saum npoo, hardening, brazing, txiav, 3D printing thiab additive manufacturing. Thawj qhov kev loj hlob ntawm high-power nruam laser tshuab tau tshwm sim ua ntej 2000, thaum lub zog siab 10.6µm wavelength carbon dioxide (CO2) laser thiab ze-infrared 1064nm wavelength semiconductor-pumped Nd: YAG solid-state laser tau tsim. Txawm li cas los xij, vim nws qhov wavelength, carbon dioxide lasers nyuaj rau kev xa tawm los ntawm cov fibers optical, uas ua rau muaj teeb meem rau kev lag luam; thaum lub zog-state lasers raug txwv los ntawm qhov ci thiab lub zog ua kom muaj peev xwm. Tom qab xyoo 2000, high-power industrial fiber lasers pib tawm los ua cov kev daws teeb meem rau high-brightness, high-power lasers uas tuaj yeem xa los ntawm fiber ntau optical. Niaj hnub no, fiber ntau lasers tau hloov CO2 lasers nyob rau hauv feem ntau ntawm daim ntawv thov thiab tau zoo siv nyob rau hauv ntau yam kev lag luam daim ntawv thov. Tshwj xeeb tshaj yog nyob rau hauv xyoo tas los no, nws tau dhau los ua lub zog tseem ceeb ntawm kev lag luam lasers, xws li laser vuam thiab txiav, uas muaj kev ceev dua, kev ua tau zoo thiab kev ntseeg siab dua li carbon dioxide lasers.

Txawm li cas los xij, cov CW high-power fiber lasers feem ntau ua haujlwm ntawm ze-infrared (NIR) wavelengths, hauv 1 µm, uas yog qhov zoo rau ntau daim ntawv thov. Piv txwv li, nws yog qhov tsim nyog rau kev ua cov hlau nrog qhov nqus ntawm ntau dua 50 feem pua, tab sis nws raug txwv vim qee cov hlau cuam tshuam 90 feem pua ​​​​lossis ntau dua ntawm qhov ze-infrared laser hluav taws xob tshwm sim ntawm lawv qhov chaw. Tshwj xeeb tshaj yog welding daj hlau xws li tooj liab thiab kub nrog ze-infrared lasers, vim qhov tsawg nqus tus nqi, qhov no txhais tau hais tias ntau lub zog laser yuav tsum tau pib lub vuam txheej txheem. Feem ntau muaj ob txoj kev siv laser vuam: kev siv hom vuam (qhov twg cov khoom tsuas yog melted thiab reflowed) thiab sib sib zog nqus hom vuam (qhov twg lub laser vaporizes cov hlau thiab lub vapor siab tsim ib kab noj hniav los yog keyhole). Sib sib zog nqus hom welding ua rau lub laser beam absorbed heev vim muaj ntau yam kev cuam tshuam lub laser beam muaj nrog cov hlau thiab hlau vapor thaum nws mus los ntawm cov khoom. Txawm li cas los xij, ua kom lub qhov tseem ceeb nrog lub laser ze-infrared yuav tsum muaj qhov teeb meem loj heev, tshwj xeeb tshaj yog tias cov khoom siv welded yog qhov zoo heev. Thiab thaum lub keyhole yog tsim, tus nqi nqus yuav nce sharply, thiab lub siab hlau vapor siab generated los ntawm lub high-power ze-infrared laser nyob rau hauv lub molten pas dej ua ke yuav ua rau spatter thiab porosity, yog li ntawd lub zog laser los yog vuam ceev yuav tsum tau. ua tib zoo tswj kom tsis txhob muaj ntau dhau Spatter yog ejected los ntawm weld. Cov vapors hlau thiab " npuas" hauv cov txheej txheem roj kuj tseem tuaj yeem raug daig thaum lub pas dej molten solidifies, tsim cov porosity hauv qhov sib koom ua ke. Xws li porosity ua rau lub zog weld tsis muaj zog thiab ua rau kom muaj kev sib koom ua ke, uas ua rau muaj qhov tsis zoo welded sib koom ua ke. Yog li ntawd, NIR lasers yog qhov nyuaj heev rau kev ua cov ntaub ntawv xws li tooj liab nrog<5% absorption at 1 µm. In order to process these high-reflectivity materials better, methods such as increasing the laser absorption rate of the material by generating plasma on the processed material have been adopted. However, because these methods limit material processing to deep penetration processes, conduction mode welding cannot be used for thin materials, and there are inherent risks of sputtering and controlled energy deposition. Therefore, existing 1 µm laser systems have their limitations when processing highly reflective materials such as non-ferrous metals, as well as in underwater applications.

Txhawm rau tsim cov ntawv nyob ze-infrared laser-tswj, tib neeg yuav tsum tau tshawb fawb txog cov teeb pom kev tshiab ntawm laser. Tsis tas li ntawd, txhawm rau txhawm rau txo cov pa hauv tsev cog khoom, cov tsheb tshiab lub zog tau hloov cov roj av thiab cov tshuab hluav taws xob sab hauv nrog lub tshuab hluav taws xob. Qhov loj ntawm tooj liab siv nyob rau hauv kev tsim kho ntawm lub tshuab hluav taws xob, tshwj xeeb tshaj yog cov roj teeb hluav taws xob, tau tsim cov kev xav tau loj heev rau cov kev daws teeb meem tooj liab txhim khu kev qha, thaum lwm lub tshuab hluav taws xob tauj dua tshiab xws li cua turbines, muaj ntau yam sib npaug ntawm kev siv.

2. Lub hnub yug ntawm lub zog siab xiav laser

Txoj kev loj hlob ntawm kev lag luam laser technology yeej ib txwm tau tsim raws li txoj hauv kev ntawm cov cuab yeej tsim khoom thiab cov kev xav tau tshiab. Hauv 60 xyoo dhau los, los ntawm kev lag luam digital thiab zej zog, mus rau lub zog ruaj khov, mus rau lub neej noj qab haus huv, laser tshuab tau txais txiaj ntsig zoo los daws cov haujlwm tseem ceeb hauv lub neej yav tom ntej ntawm noob neej. Niaj hnub no, laser thev naus laus zis yog ib feem tseem ceeb ntawm ntau qhov chaw tseem ceeb ntawm peb txoj kev lag luam, los ntawm cov cuab yeej tsim khoom mus rau kev tsim kho tsheb, kev kho mob, kev ntsuas thiab ib puag ncig technology, thiab cov ntaub ntawv thiab kev sib txuas lus technology. Raws li cov txheej txheem hlau ua haujlwm txuas ntxiv mus ntxiv thiab cov neeg siv yuav tsum tau nce ntxiv, lasers xav tau kev tsim kho tshiab ntawm cov nqi thiab kev siv hluav taws xob nrog rau kev ua haujlwm laser. Kev lag luam thov rau kev ua haujlwm zoo ntawm cov hlau uas muaj kev cuam tshuam zoo heev tau txhawb txoj kev loj hlob ntawm xiav lub zog laser tshuab, uas yuav muaj tseeb qhib qhov rooj rau cov thev naus laus zis tshiab hauv kev ua hlau.

Rau cov hlau uas tsis yog-ferrous, lawv qhov nqus ntawm lub teeb lub zog nce ntxiv thaum lub wavelength ntawm lub teeb txo qis. Piv txwv li, lub teeb haum ntawm tooj liab ntawm wavelengths qis dua 500nm yuav nce los ntawm tsawg kawg yog 50 feem pua ​​​​piv nrog lub teeb infrared, yog li lub teeb luv luv wavelengths zoo dua rau kev ua tooj liab. Qhov teeb meem yog tias kev tsim lub voj voog luv luv, lub zog loj lasers rau cov ntawv thov kev lag luam no nyuaj; ob peb txoj kev xaiv muaj hwj chim siab muaj, thiab txawm tias cov uas muaj nyob ntawd tseem kim thiab tsis muaj txiaj ntsig. Piv txwv li, muaj qee qhov khoom siv hluav taws xob hauv lub xeev laser ntawm kev ua lag luam raws li qhov zaus ob npaug uas tuaj yeem siv nyob rau hauv qhov kev sib tw wavelength, tsim lub teeb laser ntawm wavelengths ntawm 515nm thiab 532nm (ntsuab spectrum). Txawm li cas los xij, cov khoom siv laser no tso siab rau lawv cov khoom siv kho qhov muag uas tsis yog-linear los hloov lub twj tso kua mis laser zog rau lub zog ntawm lub hom phiaj wavelength. Cov txheej txheem hloov dua siab tshiab ua rau lub zog poob siab, thiab lub laser yuav tsum tau ua kom txias txias thiab complex optical setups.

Yuav kom ua tau raws li qhov kev sib tw no, tib neeg muab lawv cov xim xiav semiconductor lasers. Ib qho yog vim Blu-duab tshav muaj nws cov khoom tshwj xeeb. High-reflectivity hlau cov ntaub ntawv muaj lub siab nqus ntawm lub teeb xiav, uas txhais tau hais tias lub teeb xiav muaj qhov txiaj ntsig zoo hauv kev ua hlau ntawm cov ntaub ntawv zoo heev (xws li tooj liab, thiab lwm yam). Raws li pom hauv daim duab 1, qhov nqus ntawm lub teeb xiav los ntawm tooj liab yog ntau tshaj 13 × (13 zaug) siab dua li ntawm lub teeb infrared. Tsis tas li ntawd, tus nqi nqus tsis hloov ntau thaum tooj liab melted. Thaum lub xiav laser pib vuam, tib lub zog ceev yuav ua rau vuam mus. Blu-duab tshav laser welding yog inherently zoo-tswj thiab tsawg-kho, thiab qhov tshwm sim yog ceev thiab zoo brazed welds. Nyob rau tib lub sijhawm, lub teeb xiav yog absorbed tsawg dua hauv dej hiav txwv, yog li nws muaj qhov sib kis tau ntev dua, uas ua rau nws muaj peev xwm txhim kho thaj chaw ntawm underwater laser khoom ua. Tsis tas li ntawd, lub teeb xiav yog qhov yooj yim los hloov mus rau lub teeb dawb, yog li cov teeb pom kev zoo thiab lwm yam teeb pom kev zoo tuaj yeem siv tau zoo heev siv cov lasers xiav. Qhov thib ob yog tias semiconductor lasers raws li cov khoom siv gallium nitride tuaj yeem tsim lub teeb laser ncaj qha nrog lub wavelength ntawm 450nm yam tsis muaj ntau zaus ob npaug, yog li lawv muaj zog dua hloov dua siab tshiab.

Lub laser nrog lub wavelength ntawm 450nm yuav tsum ua kom cov khoom ua tau zoo ntawm tooj liab los ntawm ze li ntawm 20 npaug piv nrog lub wavelength ntawm 1µm. Piv nrog rau cov txheej txheem ze-infrared laser vuam txheej txheem, high-power xiav lasers muaj ntau yam thiab zoo. Quantitative zoo: nce welding speeds thiab ib tug dav txheej txheem qhov rais txhais ncaj qha mus rau hauv ceev productivity thiab txo qhov ntau lawm downtime. Cov txiaj ntsig zoo: ntau dua txheej txheem latitude, spatter-free thiab porosity-dawb zoo welds, nrog rau cov neeg kho tshuab siab zog thiab qis hluav taws xob resistivity. Qhov sib xws ntawm vuam zoo tuaj yeem txhim kho cov txiaj ntsig ntau lawm. Tsis tas li ntawd, lub laser xiav kuj tseem tuaj yeem ua cov cua sov ua haujlwm vuam hom, uas tsis tuaj yeem ua tau nrog qhov ze-infrared laser.

Cov ntaub ntawv tiv tauj:

Yog tias koj muaj lus nug, thov hu rau peb. Txawm peb cov neeg muas zaub nyob qhov twg thiab peb cov kev xav tau yog dab tsi, peb yuav ua raws li peb lub hom phiaj los muab peb cov neeg siv khoom zoo, tus nqi qis, thiab kev pabcuam zoo tshaj plaws.