Hauv ntau daim ntawv thov, nws yog qhov yooj yim rau ob peb qhov tso zis ntawm lub laser diode rau hauv cov khoom siv kho qhov muag kom xa lub teeb rau qhov twg nws xav tau.
Qhov zoo:
Lub teeb emissions los ntawm fiber ntau muaj ib puag ncig, du (homogenized) siv profile thiab symmetrical beam zoo, uas yog yooj yim heev nyob rau hauv ntau rooj plaub. Piv txwv li, tsawg dua optics yuav tsum tau tsim ib puag ncig lub twj tso kua mis rau qhov kawg-pumped solid-state laser.
Lub laser diode tuaj yeem raug tshem tawm ua ke nrog nws cov cua txias, piv txwv li los ntawm lub taub hau ntawm lub xeev khov kho laser, uas tuaj yeem ua kom zoo dua qub thiab tawm ntau qhov chaw rau lwm qhov ntawm no.
Ib qho teeb meem fiber ntau-coupled diode laser tuaj yeem hloov tau yooj yim yam tsis hloov qhov sib dhos ntawm cov cuab yeej siv lub teeb.
Fiber-coupled Cheebtsam tuaj yeem yooj yim ua ke nrog lwm cov khoom siv fiber ntau.
Hom fiber-coupled diode lasers
Ntau lub diode lasers raug muag hauv daim ntawv fiber ntau, nrog rau cov khoom siv fiber ntau txuas rau hauv cov pob laser (xws li, mus tas li laser vuam fiber ntau txuas). Cov fibers thiab thev naus laus zis siv rau cov diode lasers sib txawv heev:
Cov ntaub ntawv yooj yim tshaj plaws yog VCSEL (Vertical Cavity Surface Emitting Laser), uas feem ntau emits ib lub teeb nrog lub teeb pom kev zoo, nruab nrab beam divergence, tsis muaj astigmatism thiab ib ncig siv siv. Ib qho yooj yim spherical lens yog txaus rau imaging lub emission point rau hauv cov tub ntxhais ntawm ib hom fiber ntau. Coupling kev ua tau zoo ntawm qhov kev txiav txim ntawm 70-80% tuaj yeem ua tiav. Nws kuj tseem ua tau rau ob peb (lub pob tw-pob txha) cov fiber ntau ncaj qha mus rau qhov chaw tawm ntawm VCSEL.
Cov ntug me me-emitting laser diodes kuj emit nyob rau hauv ib tug tib spatial hom thiab yog li nyob rau hauv txoj cai kuj tso cai npaum coupling rau ib hom fibers. Txawm li cas los xij, yog tias siv lub ntsej muag kheej kheej yooj yim, qhov kev sib txuas ua haujlwm tau txo qis los ntawm ellipticity ntawm cov nqaj. Tsis tas li ntawd, lub beam divergence kuj siab nyob rau hauv tsawg kawg yog ib qho kev taw qhia, yuav tsum tau lo ntsiab muag nrog tus lej aperture siab. Lwm qhov teeb meem yog qhov astigmatism ntawm lub diode tso zis, tshwj xeeb tshaj yog rau nce-guided diodes; qhov no tuaj yeem raug them nyiaj los ntawm qhov tsis muaj zog cylindrical ntxiv. Nrog cov zis muaj zog txog li ob peb puas milliwatts, fiber ntau-coupled nce-guided LDs tuaj yeem siv los twj, piv txwv li, erbium-doped fiber amplifiers.
Schematic teeb ntawm ib qho yooj yim fiber-coupled low-power edge-emitting laser diode. Lub lens kheej kheej (lossis tej zaum yog ob lub lens) yog siv los ua duab lub laser diode facet rau hauv cov tub ntxhais fiber ntau. Beam ellipticity thiab astigmatism txo cov coupling efficiency.
Wide-chaw laser diodes yog spatial multimode nyob rau hauv txoj kev ntev ntawm lub emitter. Yog hais tias lub voj voog puag ncig tsuas yog zoo li lub ntsej muag cylindrical thiab tom qab ntawd tso rau hauv ib qho fiber ntau, ntau qhov ci ntsa iab (radiance) yuav ploj mus vim tias cov nqaj siab zoo nyob rau hauv txoj kev ceev axis tsis tuaj yeem siv tau. Piv txwv li, 1 W ntawm lub zog tuaj yeem raug xa mus rau hauv ib qho khoom siv fiber ntau nrog ib txoj kab uas hla ntawm 50 μm thiab tus lej aperture (NA) ntawm 0.12. Qhov no yog qhov txaus los tso cov tshuab hluav taws xob qis qis, xws li microchip lasers. Txawm tias lub zog ntawm 10 W tuaj yeem ua tau.
Schematic teeb ntawm ib qho yooj yim fiber-coupled wide-chaw laser diode. Lub lens fiber ntau yog siv los sib tsoo lub nqaj nyob rau hauv txoj kev ceev axis.
Ib qho kev txhim kho dav dav ntawm lub tshuab laser yog ua raws li kev tsim cov kab teeb ua ntej tso kom tau txais cov kab hluav taws xob zoo (tsis yog lub voj voog sib luag). Qhov no tso cai rau kom brightness ntau dua.
Rau diode tuav (diode arrays), qhov teeb meem ntawm asymmetric beam zoo yog qhov hnyav dua. Ntawm no, cov txiaj ntsig ntawm tus kheej emitters tuaj yeem ua ke rau hauv cov fibers cais ntawm ib pob fiber ntau. Cov fibers yog teem nyob rau hauv ib tug linear array ntawm ib sab ntawm lub diode bar, tab sis nyob rau hauv ib tug ncig array nyob rau hauv cov zis kawg. Xwb, qee yam ntawm beam shaper tuaj yeem siv los ua cov nqaj zoo symmetrical ua ntej tso rau hauv ib qho multimode fiber ntau. Qhov no tuaj yeem ua tau, piv txwv li, nrog ob daim iav beam shaper lossis qee qhov micro-optics. Piv txwv li, 30 W tuaj yeem ua ke rau hauv fiber ntau nrog ib txoj kab uas hla ntawm 200-μm (los yog txawm tias 100-μm) thiab NA ntawm 0.22. Xws li kev teeb tsa tuaj yeem siv tau, piv txwv li, txhawm rau tso Nd:YAG lossis Nd:YVO 4 lasers nrog lub zog tso zis ntawm 15 W.
Rau lub diode pawg, fibers nrog ib tug loj core txoj kab uas hla yog siv. Piv txwv li, ntau pua watts (los yog txawm kilowatts) ntawm lub hwj chim kho qhov muag tuaj yeem ua ke rau hauv ib qho fiber ntau nrog ib txoj kab uas hla ntawm 600 μm thiab ib qho NA=0.22.
Disadvantages ntawm fiber ntau coupling
Qee qhov tsis zoo ntawm fiber ntau-coupled diode lasers piv rau qhov chaw dawb emitting lasers yog:
Tus nqi siab dua. Txawm li cas los xij, qhov no tuaj yeem cuam tshuam los ntawm kev txuag tau los ntawm kev yooj yim dua nqaj tuav thiab xa khoom.
Cov zis hluav taws xob tau txo qis me ntsis, thiab qhov tseem ceeb tshaj, radiance. Lub radiance poob yuav loj (dhau ntawm qhov kev txiav txim ntawm qhov ntau) lossis me me, nyob ntawm cov txheej txheem fiber ntau txuas. Qee zaum qhov no yuav tsis muaj teeb meem, tab sis nyob rau lwm qhov nws qhia txog cov teeb meem tseem ceeb xws li kev tsim lub diode-pumped bulk laser lossis high-power fiber laser.
Feem ntau (tshwj xeeb tshaj yog multimode fibers), cov fiber ntau tsis yog polarization-tswj. Cov zis fiber ntau yuav feem ntau yog ib nrab polarized, thiab lub xeev polarization yuav hloov thaum cov fiber ntau txav los yog thaum kub hloov. Qhov no tuaj yeem ua rau muaj teeb meem kev ruaj ntseg loj rau diode-pumped solid-state lasers thaum lub twj tso kua mis yog polarization-dependent (xws li hauv Nd: YVO 4 ).
Fiber-coupled laser diode cov khoom kuj tseem yuav tsis muaj rau txhua qhov kev kho qhov muag wavelength.
Fiber Output Beam Zoo
Lub nqaj zoo ntawm cov zis fiber ntau feem ntau tsis tau teev tseg; nyob rau hauv ntau zaus tsuas yog cov tub ntxhais txoj kab uas hla thiab tus lej aperture (NA) paub, thiab cov kauj ruam-index multimode fiber ntau yog xam. Nyob rau hauv cov ntaub ntawv no, tsis muaj mis nyuj los laij cov nqaj zoo raws nraim, vim nws nyob ntawm lub optical fais fab faib tshaj cov fiber ntau hom, uas nws tus kheej yog nyob ntawm lub launching tej yam kev mob. Txawm li cas los xij, lub teeb pom kev zoo M2 tuaj yeem kwv yees kwv yees, piv txwv tias lub zog tau muab faib zoo rau cov qauv thiab yog li tus lej aperture sawv cev rau qhov kev kwv yees tsim nyog ntawm qhov tseeb beam divergence (uas yuav siab dua me ntsis). Qhov no ua rau qhov sib npaug M2≈(π /λ)ΝΑ, qhov twg a yog lub vojvoog fiber ntau (piv txwv li, ib nrab ntawm cov tub ntxhais txoj kab uas hla). Cov kab teeb pom kev zoo kuj tseem tuaj yeem txhim kho tau zoo yog tias lub teeb tau pib feem ntau nyob rau hauv cov kev txiav txim qis qis, tab sis nws yuav raug degraded los ntawm kev khoov ntawm cov fiber ntau.
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