Lub hauv paus ntsiab lus ntawm ib hom fiber ntau lasers

Lub hauv paus ntsiab lus ntawmib hom fiber ntau lasers

Lub cim ntawm laser yuav tsum tau ntsib peb lub hauv paus tej yam kev mob: pej xeem inversion, ib tug tsim nyog resonant kab noj hniav, thiab ncav lublaserqhov pib (qhov nce ntawm lub teeb nyob rau hauv lub resonant kab noj hniav yuav tsum ntau tshaj qhov poob). Lub tshuab ua haujlwm ntawm ib hom fiber ntau lasers yog ua raws li cov hauv paus ntsiab lus ntawm lub cev thiab ua tiav kev ua tau zoo los ntawm cov qauv tshwj xeeb ntawm fiber ntau waveguide.

Kev txhawb zog hluav taws xob thiab cov pej xeem inversion yog lub hauv paus ntawm lub cev rau tiam ntawm lasers. Thaum lub teeb lub zog tawm los ntawm lub twj tso kua mis (feem ntau yog semiconductor laser diode) raug txhaj rau hauv qhov nce fiber ntau doped nrog lub ntiaj teb tsis tshua muaj ions (xws li Ytterbium Yb³⁺, erbium Er³⁺), lub ntiaj teb tsis tshua muaj ions nqus lub zog thiab kev hloov ntawm lub ntiaj teb mus rau lub xeev zoo siab. Thaum tus naj npawb ntawm ions nyob rau hauv lub xeev zoo siab tshaj qhov uas nyob rau hauv lub xeev av, ib tug pej xeem inversion xeev yog tsim. Nyob rau ntawm lub sijhawm no, qhov xwm txheej photon yuav ua rau cov hluav taws xob txhawb zog ntawm lub zog-lub xeev ion, tsim cov photons tshiab ntawm tib zaus, theem thiab kev taw qhia raws li qhov xwm txheej photon, yog li ua tiav qhov kho qhov muag amplification.

Lub ntsiab feature ntawm ib homfiber ntau lasersnyob rau hauv lawv txoj kab uas hla zoo heev (feem ntau 8-14μm). Raws li yoj optics txoj kev xav, cov tub ntxhais zoo li no tsuas yog tso cai rau ib hom electromagnetic teb (piv txwv li, hom hom LP₀₁ lossis HE₁₁ hom) kom kis tau zoo, uas yog, hom nkaus xwb. Qhov no tshem tawm cov teeb meem intermodal dispersion uas twb muaj lawm nyob rau hauv multimode fibers, uas yog, mem tes broadning tshwm sim tshwm sim los ntawm propagation ntawm txawv hom ntawm txawv speeds. Los ntawm qhov kev xav ntawm cov yam ntxwv kis tau tus mob, txoj kev sib txawv ntawm lub teeb propagating raws axial kev taw qhia nyob rau hauv ib hom kev kho qhov muag fibers yog heev me me, uas ua rau cov zis beam muaj zoo meej spatial coherence thiab Gaussian zog tis, thiab lub beam zoo tshaj M² yuav mus txog 1 (M² = 1 rau ib tug zoo tagnrho Gaussian beam).

Fiber lasers yog cov neeg sawv cev zoo tshaj plaws ntawm peb tiamlaser tshuab, uas siv lub ntiaj teb tsis tshua muaj caij-doped iav fibers ua qhov nce nruab nrab. Ntau xyoo dhau los, ib hom fiber ntau lasers tau tuav ib qho tseem ceeb hauv kev lag luam laser thoob ntiaj teb, ua tsaug rau lawv qhov kev ua tau zoo tshwj xeeb. Piv nrog rau multimode fiber ntau lasers los yog ib txwm muaj zog-xeev lasers, ib hom fiber ntau lasers tuaj yeem tsim ib qho zoo tagnrho Gaussian beam nrog ib tug beam zoo nyob ze rau 1, uas txhais tau hais tias lub beam yuav luag mus txog qhov theoretical yam tsawg kawg nkaus divergence lub kaum sab xis thiab yam tsawg kawg nkaus tsom qhov chaw. Qhov no feature ua rau nws irreplaceable nyob rau hauv lub teb ntawm kev ua thiab kev ntsuas uas yuav tsum tau high precision thiab tsawg thermal cuam tshuam.