A yau, za mu gabatar da laser "monochromatic" zuwa matsananci - kunkuntar layin layi.Fitowar sa ya cika giɓi a yawancin filayen aikace-aikacen Laser, kuma a cikin 'yan shekarun nan an yi amfani da shi sosai a cikin ganowar motsin motsi, liDAR, fahimtar rarrabawa, sadarwa mai sauri mai daidaituwa da sauran fannoni, wanda shine "manufa" wanda ba zai iya zama ba. kammala kawai ta hanyar inganta wutar lantarki.
Menene Laser kunkuntar layin layi?
Kalmar "layin nisa" yana nufin faɗin layi na laser a cikin yanki na mita, wanda yawanci ana ƙididdige shi dangane da rabin girman cikakken nisa na bakan (FWHM).An fi shafan layin layi ta hanyar raɗaɗin kai tsaye na atoms ko ions masu zumudi, hayaniyar lokaci, girgizar injin na'urar resonator, jitter zafin jiki da sauran abubuwan waje.Ƙananan darajar layin layi, mafi girma da tsabta na bakan, wato, mafi kyawun monochromaticity na laser.Laser masu irin waɗannan halayen yawanci suna da ɗan ƙaran lokaci ko amo mai ƙarfi da ƙarar ƙarar ƙaranci.A lokaci guda, ƙarami ƙimar faɗin layi na Laser, yana da ƙarfi daidai da daidaituwa, wanda ke bayyana azaman tsayin haɗin kai mai tsayi.
Ganewa da aikace-aikacen Laser kunkuntar layin layi
Iyakance ta ainihin ribar layi na kayan aiki na Laser, yana da kusan ba zai yiwu ba kai tsaye a gane fitar da kunkuntar layin layi ta hanyar dogaro da oscillator na gargajiya da kansa.Don gane da aiki na kunkuntar layin Laser, yawanci ya zama dole a yi amfani da filtata, grating da sauran na'urori don iyakance ko zaɓi madaidaicin ma'aunin a cikin bakan riba, ƙara bambance-bambancen riba tsakanin hanyoyin madaidaiciya, ta yadda akwai 'yan kaɗan ko ma ɗaya ne kawai na yanayin juyawa a cikin resonator na Laser.A cikin wannan tsari, sau da yawa ya zama dole don sarrafa tasirin amo akan fitarwar laser, da kuma rage girman faɗaɗa layin da ke haifar da girgizawa da canjin yanayin yanayin waje;A lokaci guda kuma, ana iya haɗa shi tare da bincike na lokaci ko mitar amo na yanayi mai yawa don fahimtar tushen amo da haɓaka ƙirar Laser, don cimma daidaiton fitarwa na kunkuntar layin Laser.
Bari mu dubi fahimtar kunkuntar layi na aiki na nau'ikan laser daban-daban.
Semiconductor Laser suna da fa'ida daga m size, high dace, tsawon rai da kuma tattalin arziki fa'idodin.
Fabry-Perot (FP) resonator na gani da aka yi amfani da shi a cikin gargajiyasemiconductor lasersgabaɗaya yana oscillates a cikin yanayin tsayi-tsayi da yawa, kuma faɗin layin fitarwa yana da faɗi kaɗan, don haka yana da mahimmanci don haɓaka bayanan gani don samun fitowar kunkuntar layin layi.
Rarraba ra'ayi (DFB) da Rarraba Bragg tunani (DBR) su ne nau'i biyu na zahiri na ciki na ra'ayi semiconductor.Saboda ƙaramar farar grating da kyakkyawan zaɓi na tsawon tsayi, yana da sauƙi don cimma ingantaccen madaidaicin kunkuntar fitowar layi.Babban bambanci tsakanin tsarin biyu shine matsayi na grating: tsarin DFB yawanci yana rarraba tsarin lokaci-lokaci na Bragg grating a ko'ina cikin resonator, kuma resonator na DBR yawanci ya ƙunshi tsarin grating na tunani da yankin riba da aka haɗa a ciki. saman karshen.Bugu da ƙari, lasers na DFB suna amfani da gratings da aka haɗa tare da ƙananan bambanci mai mahimmanci da ƙananan tunani.Laser na DBR suna amfani da gratings na saman tare da babban bambanci mai jujjuyawa da babban haske.Dukansu tsarin suna da babban kewayon sifofi na kyauta kuma suna iya yin gyaran tsayin raƙuman ruwa ba tare da tsalle-tsalle ba a cikin kewayon nanometer kaɗan, inda Laser DBR yana da kewayon daidaitawa fiye daFarashin DFB.Bugu da kari, fasahar ra'ayi na gani na rami na waje, wanda ke amfani da abubuwan gani na waje don amsa hasken wutar lantarki mai fita na guntu Laser na semiconductor kuma zaɓi mitar, kuma na iya gane kunkuntar aikin laser semiconductor.
(2) Fiber Laser
Fiber Laser da high famfo hira yadda ya dace, mai kyau katako ingancin da high hada guda biyu yadda ya dace, waxanda suke da zafi bincike batutuwa a cikin Laser filin.A cikin mahallin shekarun bayanan, Laser fiber yana da kyakkyawar dacewa tare da tsarin sadarwar fiber na gani na yanzu a kasuwa.Laser firikwensin firikwensin firikwensin guda ɗaya tare da fa'idodin kunkuntar layin nisa, ƙaramar amo da kyakkyawar haɗin kai ya zama ɗayan mahimman kwatance na ci gabanta.
Single a tsaye yanayin aiki ne ainihin fiber Laser cimma kunkuntar line-nisa fitarwa, yawanci bisa ga tsarin da resonator na guda mitar fiber Laser za a iya raba zuwa DFB irin, DBR irin da zobe irin.Daga cikin su, ka'idar aiki na DFB da DBR guda-mita fiber Laser yayi kama da na DFB da DBR semiconductor lasers.
Kamar yadda aka nuna a cikin Hoto 1, DFB fiber Laser shine a rubuta rarraba Bragg grating a cikin fiber.Saboda tsawon aiki na oscillator yana shafar lokacin fiber, ana iya zaɓar yanayin tsayin daka ta hanyar rarraba ra'ayi na grating.Laser resonator na DBR Laser yawanci kafa ta biyu fiber Bragg gratings, kuma guda a tsaye yanayin da aka zaba mafi kunkuntar band da low reflectivity fiber Bragg gratings.Duk da haka, saboda dogon resonator, hadaddun tsarin da kuma rashin tasiri mita nuna bambanci inji, zobe mai siffar zobe ne mai yiwuwa ga yanayin hopping, kuma yana da wuya a yi aiki stably a akai a tsaye yanayin na dogon lokaci.
Hoto 1, Tsarukan layi na yau da kullun na mitoci guda biyufiber Laser
Lokacin aikawa: Nuwamba-27-2023