Impumelelo! I-laser yefayibha ye-3 μm ephakathi kwe-infrared femtosecond enamandla aphezulu ehlabathini

Impumelelo! Amandla aphezulu ehlabathini angama-3 μm phakathi kwe-infraredi-laser yefayibha ye-femtosecond

I-laser yefayibhaUkuze kufezekiswe imveliso yelaser ephakathi kwe-infrared, inyathelo lokuqala kukukhetha izinto ezifanelekileyo ze-fiber matrix. Kwii-laser zefayibha ezikufutshane ne-infrared, i-quartz glass matrix yeyona nto ixhaphakileyo ye-fiber matrix enelahleko ephantsi kakhulu yokudlulisela, amandla oomatshini athembekileyo kunye nozinzo oluhle kakhulu. Nangona kunjalo, ngenxa yamandla aphezulu e-phonon (1150 cm-1), i-quartz fiber ayinakusetyenziswa kwi-mid-infrared laser transmission. Ukuze kufezekiswe ukuhanjiswa okuphantsi kokulahleka kwe-mid-infrared laser, kufuneka siphinde sikhethe ezinye izinto ze-fiber matrix ezinamandla aphantsi e-phonon, njenge-sulfide glass matrix okanye i-fluoride glass matrix. I-Sulfide fiber inamandla aphantsi e-phonon (malunga ne-350 cm-1), kodwa inengxaki yokuba uxinzelelo lwe-doping alunakwandiswa, ngoko ke ayifanelekanga ukusetyenziswa njenge-gain fiber ukuvelisa i-mid-infrared laser. Nangona i-substrate yeglasi ye-fluoride inamandla aphezulu e-phonon (550 cm-1) kune-substrate yeglasi ye-sulfide, inokufumana ukuhanjiswa okuphantsi kwelahleko kwiilaser ze-mid-infrared ezine-wavelengths ezingaphantsi kwe-4 μm. Okubaluleke ngakumbi, i-substrate yeglasi ye-fluoride inokufikelela kwi-concentration ephezulu ye-rare earth ion doping, enokubonelela ngenzuzo efunekayo kwi-mid-infrared laser, umzekelo, i-fluoride ZBLAN fiber evuthiweyo ye-Er3+ ikwazile ukufikelela kwi-concentration ye-doping ukuya kuthi ga kwi-10 mol. Ke ngoko, i-fluoride glass matrix yeyona nto ifanelekileyo kwi-fiber matrix kwiilaser ze-mid-infrared fiber.

Kutshanje, iqela likaNjingalwazi uRuan Shuangchen kunye noNjingalwazi uGuo Chunyu kwiYunivesithi yaseShenzhen baphuhlise i-femtosecond enamandla kakhului-pulse fiber laseryenziwe nge-2.8μm mode-locked Er:ZBLAN fiber oscillator, i-single-mode Er:ZBLAN fiber preamplifier kunye ne-large-mode field Er:ZBLAN fiber main amplifier.
Ngokusekelwe kwithiyori yokuzicinezela kunye nokukhulisa i-pulse ye-mid-infrared ultra-short pulse elawulwa yi-polarization state kunye nomsebenzi wokulinganisa amanani weqela lethu lophando, kunye neendlela zokulawula i-nonlinear kunye ne-mode compression ye-large-mode optical fiber, iteknoloji yokupholisa esebenzayo kunye nesakhiwo sokukhulisa i-double-end pump, inkqubo ifumana i-2.8μm ultra-short pulse output enamandla aphakathi kwe-8.12W kunye nobubanzi be-pulse ye-148 fs. Irekhodi lamazwe ngamazwe lamandla aphakathi aphezulu afunyenwe leli qela lophando lihlaziywe ngakumbi.

Umfanekiso 1 Umzobo wolwakhiwo lwe-Er:ZBLAN fiber laser esekwe kwisakhiwo se-MOPA
Ulwakhiwo lwei-laser ye-femtosecondInkqubo iboniswe kuMfanekiso 1. I-single-mode double-clad Er:ZBLAN fiber enobude obuyi-3.1 m isetyenzisiwe njenge-gain fiber kwi-preamplifier ene-doping concentration ye-7 mol.% kunye ne-core diameter ye-15 μm (NA = 0.12). Kwi-main amplifier, i-double clad large mode field Er:ZBLAN fiber enobude obuyi-4 m isetyenzisiwe njenge-gain fiber ene-doping concentration ye-6 mol.% kunye ne-core diameter ye-30 μm (NA = 0.12). I-core diameter enkulu yenza i-gain fiber ibe ne-nonlinear coefficient ephantsi kwaye inokumelana namandla aphezulu e-peak kunye ne-pulse output ephezulu yamandla e-pulse amakhulu. Zombini iziphelo ze-gain fiber zidibene ne-AlF3 terminal cap.