Kapangidwe ka njira yowunikira ya ma laser ozungulira

Kapangidwe ka njira yowunikira ya rectanglema laser ozungulira

Chidule cha kapangidwe ka njira yowunikira

Laser ya ulusi wopangidwa ndi thulium-doped fiber laser yokhala ndi mawonekedwe awiri osasinthika (passive mode-locked dual-wavelength dissipative soliton resonant thulium-doped fiber laser) yochokera pa kapangidwe ka galasi la mphete ya ulusi wosakhala mzere.

2. Kufotokozera njira yowunikira

Soliton resonant thulium-doped yokhala ndi mafunde awirilaser ya ulusiimagwiritsa ntchito kapangidwe ka kapangidwe ka m'mimba ka mawonekedwe a "8″ (Chithunzi 1).

Gawo lakumanzere ndi lozungulira lalikulu lolunjika, pomwe gawo lakumanja ndi kapangidwe ka galasi lozungulira la ulusi wosalala. Lozungulira lakumanzere lolunjika limaphatikizapo chogawaniza cha bundle, ulusi wowala wa 2.7m thulium-doped (SM-TDF-10P130-HE), ndi cholumikizira cha ulusi wowala wa 2 μm chokhala ndi coupling coefficient ya 90:10. Isolator imodzi yodalira polarization-dependent (PDI), ma Polarization Controllers awiri (Polarization controllers: PC), 0.41m Polarization-maintenance Fiber (PMF). Kapangidwe ka galasi la nonlinear fiber optic ring kumanja kamapezeka polumikiza kuwala kuchokera ku lozungulira lakumanzere lolunjika kupita ku galasi la nonlinear fiber optic ring kumanja kudzera mu cholumikizira cha 2×2 structure optical chokhala ndi coefficient ya 90:10. Kapangidwe ka galasi la nonlinear fiber optic ring kumanja kakuphatikizapo ulusi wowala wa mamita 75 (SMF-28e) ndi chowongolera polarization. Ulusi wa kuwala wa mita imodzi wa 75 umagwiritsidwa ntchito kukulitsa mphamvu ya nonlinear. Pano, cholumikizira cha ulusi wa 90:10 chimagwiritsidwa ntchito kuonjezera kusiyana kwa gawo losakhala la mzere pakati pa kufalikira kwa wotchi ndi kutsutsana ndi wotchi. Kutalika konse kwa kapangidwe ka dual-wavelength aka ndi mamita 89.5. Mu kuyeserera uku, kuwala kwa pampu koyamba kumadutsa mu chophatikiza cha beam kuti kukafike ku ulusi wa optical wa gain medium thulium-doped. Pambuyo pa ulusi wa optical wa thulium-doped, cholumikizira cha 90:10 chimalumikizidwa kuti chizungulire 90% ya mphamvu mkati mwa cavity ndikutumiza 10% ya mphamvu kuchokera mu cavity. Nthawi yomweyo, fyuluta ya Lyot ya birefringent imapangidwa ndi ulusi wa optical wosunga polarization womwe uli pakati pa olamulira awiri a polarization ndi polarizer, yomwe imagwira ntchito posefa mafunde a spectral.

3. Chidziwitso cha mbiri yakale

Pakadali pano, pali njira ziwiri zazikulu zowonjezera mphamvu ya pulse ya ma laser oyendetsedwa. Njira imodzi ndikuchepetsa mwachindunji zotsatira zopanda mzere, kuphatikizapo kuchepetsa mphamvu yayikulu ya ma pulse kudzera m'njira zosiyanasiyana, monga kugwiritsa ntchito njira yogawa ma pulse otambasulidwa, ma oscillator akuluakulu ozungulira, ndi ma laser ozungulira ma beam-splitting, ndi zina zotero. Njira ina ndi kufunafuna njira zatsopano zomwe zingalolere kuchuluka kwa magawo osazungulira, monga kudzifananiza ndi ma pulse a rectangular. Njira yomwe yatchulidwa pamwambapa ikhoza kukulitsa bwino mphamvu ya pulse yalaser yozunguliraku ma nanojoules makumi ambiri. Dissipative soliton resonance (Dissipative soliton resonance: DSR) ndi njira yopangira ma impulse a rectangular yomwe idaperekedwa koyamba ndi N. Akhmediev et al. mu 2008. Khalidwe la ma dissipative soliton resonance pulses ndilakuti, ngakhale kuti amplitude imakhala yokhazikika, m'lifupi mwa ma pulse ndi mphamvu ya non-wave splitting rectangular pulse zimawonjezeka modabwitsa ndi kuwonjezeka kwa mphamvu ya pampu. Izi, mpaka pamlingo wina, zimadutsa malire a chiphunzitso chachikhalidwe cha soliton pa mphamvu ya single-pulse. Dissipative soliton resonance ikhoza kuchitika pomanga saturated absorption ndi reverse saturated absorption, monga nonlinear polarization rotation effect (NPR) ndi nonlinear fiber ring mirror effect (NOLM). Malipoti ambiri okhudza kupanga ma dissipative soliton resonance pulses amachokera ku njira ziwirizi zotsekera mode.