Babban ƙa'idar lasers na fiber guda ɗaya

Ka'idar asali taLasers na fiber guda ɗaya

Samar da laser yana buƙatar cika sharuɗɗa guda uku na asali: juyewar yawan jama'a, ramin resonant mai dacewa, da kuma isa ga isa galasermaƙasudin (ƙaruwar haske a cikin ramin resonant dole ne ya fi asarar). Tsarin aiki na lasers na fiber guda ɗaya ya dogara ne akan waɗannan ƙa'idodin zahiri na asali kuma yana cimma ingantaccen aiki ta hanyar tsarin musamman na jagororin fiber.

Hasken da aka ƙarfafa da kuma juyewar jama'a su ne tushen zahiri na samar da lasers. Lokacin da aka saka kuzarin haske da tushen famfo (yawanci diode na laser semiconductor) a cikin zare mai gain wanda aka haɗa da ions na ƙasa masu wuya (kamar Ytterbium Yb³⁺, erbium Er³⁺), ions na ƙasa masu wuya suna shan makamashi kuma suna canzawa daga yanayin ƙasa zuwa yanayin da aka motsa. Lokacin da adadin ions a cikin yanayin da aka motsa ya wuce na yanayin ƙasa, ana samar da yanayin juyewar jama'a. A wannan lokacin, photon da ya faru zai haifar da hasken da aka motsa na ions na yanayin da aka motsa, yana samar da sabbin photons iri ɗaya da mita, lokaci da alkibla kamar photon da ya faru, ta haka ne ake cimma haɓaka gani.

Babban fasalin yanayin guda ɗayana'urorin laser na fiberyana cikin diamita mai kyau na tsakiya (yawanci 8-14μm). A cewar ka'idar hasken wave, irin wannan ƙaramin tsakiya zai iya ba da damar yanayin filin lantarki guda ɗaya kawai (watau yanayin asali LP₀₁ ko yanayin HE₁₁) a watsa shi cikin kwanciyar hankali, wato, yanayin guda ɗaya. Wannan yana kawar da matsalar watsawa tsakanin hanyoyin da ke cikin zaruruwan multimode, wato, yanayin faɗaɗa bugun jini wanda ya haifar da yaɗuwar hanyoyi daban-daban a cikin gudu daban-daban. Daga mahangar halayen watsawa, bambancin hanya na yaduwar haske tare da alkiblar axial a cikin zaruruwan gani guda ɗaya ƙanƙanta ne ƙwarai, wanda ke sa hasken fitarwa ya sami cikakkiyar daidaiton sarari da rarrabawar kuzarin Gaussian, kuma ingancin hasken M² zai iya kusantar 1 (M²=1 don kyakkyawan hasken Gaussian).

Lasers na fiber sune wakilan ƙarni na uku na musammanfasahar laser, waɗanda ke amfani da zare-zaren gilashi masu ƙarancin ƙarfi a matsayin hanyar samun riba. A cikin shekaru goma da suka gabata, zare-zaren fiber guda ɗaya sun mamaye kasuwar laser ta duniya, godiya ga fa'idodin aiki na musamman. Idan aka kwatanta da zare-zaren fiber mai yawa ko laser na gargajiya mai ƙarfi, zare-zaren fiber guda ɗaya na iya samar da kyakkyawan katakon Gaussian tare da ingancin katako kusa da 1, wanda ke nufin cewa zare-zaren zai iya isa ga mafi ƙarancin bambancin ka'ida Kusurwa da mafi ƙarancin wurin mai da hankali. Wannan fasalin yana sa ba za a iya maye gurbinsa ba a fannonin sarrafawa da aunawa waɗanda ke buƙatar babban daidaito da ƙarancin tasirin zafi.