Kev siv tshuab laser rau kev siv fiber ntau optical sensing Tshooj Ob
2.2 Ib qho wavelength sweepqhov chaw laser
Qhov kev paub txog laser ib qho wavelength sweep yog qhov tseem ceeb los tswj cov khoom siv lub cev ntawm lub cuab yeej hauvlaserqhov (feem ntau yog qhov nruab nrab ntawm qhov wavelength ntawm qhov bandwidth ua haujlwm), yog li ua tiav kev tswj hwm thiab xaiv ntawm hom oscillating longitudinal hauv qhov, yog li ua tiav lub hom phiaj ntawm kev kho qhov wavelength tso zis. Raws li lub hauv paus ntsiab lus no, thaum ntxov li xyoo 1980, kev paub txog cov lasers fiber tunable tau ua tiav los ntawm kev hloov lub ntsej muag kawg ntawm lub laser nrog lub grating diffraction reflective, thiab xaiv hom laser qhov los ntawm kev tig thiab kho lub grating diffraction. Xyoo 2011, Zhu et al. siv cov lim dej tunable kom ua tiav cov zis laser ib-wavelength tunable nrog cov kab nqaim. Xyoo 2016, Rayleigh linewidth compression mechanism tau siv rau dual-wavelength compression, uas yog, kev ntxhov siab tau siv rau FBG kom ua tiav dual-wavelength laser tuning, thiab cov zis laser linewidth tau saib xyuas tib lub sijhawm, tau txais qhov wavelength tuning ntau ntawm 3 nm. Dual-wavelength ruaj khov tso zis nrog kab dav ntawm kwv yees li 700 Hz. Xyoo 2017, Zhu et al. siv graphene thiab micro-nano fiber Bragg grating los ua lub lim dej kho qhov muag tag nrho, thiab ua ke nrog Brillouin laser narrowing technology, siv cov nyhuv photothermal ntawm graphene ze li ntawm 1550 nm kom ua tiav qhov laser linewidth qis li 750 Hz thiab kev tshuaj ntsuam ceev thiab raug ntawm photocontrolled ntawm 700 MHz / ms hauv qhov ntau ntawm wavelength ntawm 3.67 nm. Raws li pom hauv Daim Duab 5. Txoj kev tswj wavelength saum toj no yeej paub txog kev xaiv hom laser los ntawm kev hloov pauv ncaj qha lossis tsis ncaj qha qhov passband center wavelength ntawm lub cuab yeej hauv lub laser cavity.
Daim Duab 5 (a) Kev teeb tsa sim ntawm qhov wavelength uas tswj tau los ntawm qhov muag-laser fiber ntau uas hloov tauthiab lub kaw lus ntsuas;
(b) Cov spectra tso zis ntawm qhov tso zis 2 nrog kev txhim kho ntawm lub twj tso kua mis tswj hwm
2.3 Lub teeb laser dawb
Kev tsim cov teeb dawb tau dhau los ntawm ntau theem xws li lub teeb halogen tungsten, lub teeb deuterium,laser semiconductorthiab lub teeb ci supercontinuum. Tshwj xeeb, lub teeb ci supercontinuum, nyob rau hauv qhov kev txhawb nqa ntawm femtosecond lossis picosecond pulses nrog lub zog super transient, tsim cov teebmeem nonlinear ntawm ntau yam kev txiav txim hauv waveguide, thiab lub spectrum tau nthuav dav heev, uas tuaj yeem npog lub band los ntawm lub teeb pom kev mus rau ze infrared, thiab muaj kev sib raug zoo. Tsis tas li ntawd, los ntawm kev kho qhov kev tawg thiab nonlinearity ntawm cov fiber tshwj xeeb, nws cov spectrum tuaj yeem txuas ntxiv mus rau nruab nrab-infrared band. Hom laser no tau siv ntau heev hauv ntau qhov chaw, xws li optical coherence tomography, roj nrhiav, biological imaging thiab lwm yam. Vim yog qhov txwv ntawm lub teeb ci thiab nonlinear medium, lub supercontinuum spectrum thaum ntxov feem ntau yog tsim los ntawm solid-state laser pumping optical iav los tsim cov supercontinuum spectrum hauv qhov pom ntau. Txij thaum ntawd los, optical fiber tau maj mam dhau los ua qhov nruab nrab zoo heev rau kev tsim wideband supercontinuum vim nws cov coefficient nonlinear loj thiab me me transmission mode field. Cov teebmeem tseem ceeb nonlinear suav nrog plaub-yoj sib xyaw, kev tsis ruaj khov ntawm kev hloov pauv, kev hloov pauv tus kheej, kev hloov pauv hla-theem, soliton splitting, Raman scattering, soliton tus kheej zaus hloov pauv, thiab lwm yam, thiab qhov sib piv ntawm txhua qhov teebmeem kuj txawv raws li qhov dav ntawm lub zog ntawm lub zog excitation thiab kev tawg ntawm cov fiber. Feem ntau, tam sim no lub teeb ci supercontinuum feem ntau yog rau kev txhim kho lub zog laser thiab nthuav dav ntau yam spectral, thiab them sai sai rau nws txoj kev tswj hwm kev sib koom ua ke.
3 Cov Lus Qhia Luv Luv
Daim ntawv no sau luv luv thiab tshuaj xyuas cov chaw siv laser los txhawb nqa cov thev naus laus zis fiber sensing, suav nrog narrow linewidth laser, single frequency tunable laser thiab broadband white laser. Cov kev xav tau ntawm daim ntawv thov thiab kev txhim kho ntawm cov lasers no hauv thaj chaw ntawm fiber sensing tau qhia meej. Los ntawm kev tshuaj xyuas lawv cov kev xav tau thiab kev txhim kho, nws tau xaus lus tias qhov chaw laser zoo tshaj plaws rau kev sensing fiber tuaj yeem ua tiav ultra-narrow thiab ultra-ruaj khov laser tso zis ntawm txhua qhov band thiab txhua lub sijhawm. Yog li ntawd, peb pib nrog narrow line width laser, tunable narrow line width laser thiab white light laser nrog dav gain bandwidth, thiab nrhiav txoj hauv kev zoo los ua kom tau qhov chaw laser zoo tshaj plaws rau kev sensing fiber los ntawm kev tshuaj xyuas lawv txoj kev txhim kho.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-21-2023