Impumelelo! I-laser ye-fiber ye-femtosecond enamandla amakhulu kunawo wonke emhlabeni engu-3 μm

Impumelelo! Amandla aphezulu kakhulu emhlabeni angama-3 μm mid-infraredi-laser yefayibha ye-femtosecond

I-laser yefayibhaUkuze kufezwe umphumela we-laser ephakathi kwe-infrared, isinyathelo sokuqala ukukhetha izinto ezifanele ze-fiber matrix. Kuma-laser e-fiber aseduze kwe-infrared, i-quartz glass matrix iyinto evame kakhulu ye-fiber matrix enokulahlekelwa kokudluliselwa okuphansi kakhulu, amandla okusebenza athembekile kanye nokuqina okuhle kakhulu. Kodwa-ke, ngenxa yamandla aphezulu e-phonon (1150 cm-1), i-quartz fiber ayikwazi ukusetshenziselwa ukudluliselwa kwe-laser ephakathi kwe-infrared. Ukuze kufezwe ukudluliselwa kokulahlekelwa okuphansi kwe-laser ephakathi kwe-infrared, sidinga ukukhetha kabusha ezinye izinto ze-fiber matrix ezinamandla aphansi e-phonon, njenge-sulfide glass matrix noma i-fluoride glass matrix. I-Sulfide fiber inamandla aphansi e-phonon (cishe ama-350 cm-1), kodwa inenkinga yokuthi ukuhlushwa kwe-doping akukwazi ukwanda, ngakho-ke ayifanele ukusetshenziswa njenge-gain fiber ukukhiqiza i-laser ephakathi kwe-infrared. Nakuba i-substrate yengilazi ye-fluoride inamandla e-phonon aphezulu kancane (550 cm-1) kune-substrate yengilazi ye-sulfide, ingaphinde ifinyelele ukudluliselwa okuphansi kwama-laser aphakathi kwe-infrared anama-wavelength angaphansi kuka-4 μm. Okubaluleke kakhulu, i-substrate yengilazi ye-fluoride ingafinyelela ukuhlushwa okuphezulu kwe-rare earth ion doping, okunganikeza inzuzo edingekayo ekukhiqizweni kwe-laser ephakathi kwe-infrared, isibonelo, i-fibre ye-fluoride ZBLAN evuthiwe kakhulu ye-Er3+ ikwazile ukufeza ukuhlushwa kwe-doping okufika ku-10 mol. Ngakho-ke, i-fluoride glass matrix iyinto efanelekile kakhulu ye-fiber matrix yama-laser aphakathi kwe-infrared.

Muva nje, ithimba likaSolwazi uRuan Shuangchen noSolwazi uGuo Chunyu eNyuvesi yaseShenzhen bathuthukise i-femtosecond enamandla amakhului-laser yefayibha ye-pulseyakhiwe nge-2.8μm mode-locked Er:ZBLAN fiber oscillator, i-single-mode Er:ZBLAN fiber preamplifier kanye ne-large-mode fibre amplifier Er:ZBLAN fiber main amplifier.
Ngokusekelwe kumbono wokuzicindezela kanye nokukhulisa we-mid-infrared ultra-short pulse elawulwa yisimo se-polarization kanye nomsebenzi wokulingisa wezinombolo weqembu lethu locwaningo, kuhlanganiswe nezindlela zokulawula i-nonlinear kanye ne-mode compression ye-large-mode optical fiber, ubuchwepheshe bokupholisa obusebenzayo kanye nesakhiwo sokukhulisa sephampu ephindwe kabili, uhlelo luthola umphumela we-2.8μm ultra-short pulse ngamandla aphakathi angu-8.12W kanye nobubanzi be-pulse obungu-148 fs. Irekhodi lomhlaba wonke lamandla aphakathi aphezulu kakhulu atholwe yileli qembu locwaningo lavuselelwa ngokwengeziwe.

Umfanekiso 1 Umdwebo wesakhiwo se-Er:ZBLAN fiber laser esekelwe kwisakhiwo se-MOPA
Isakhiwo se-i-laser ye-femtoseconduhlelo luboniswe kuMfanekiso 1. I-fibre ye-Er:ZBLAN enemodi eyodwa ephindwe kabili enobude obungu-3.1 m isetshenziswe njenge-gain fiber ku-preamplifier ene-doping concentration engu-7 mol.% kanye nobubanzi obuphakathi obungu-15 μm (NA = 0.12). Ku-amplifier eyinhloko, insimu yemodi enkulu eboshwe kabili ene-fibre ye-Er:ZBLAN enobude obungu-4 m isetshenziswe njenge-gain fiber ene-doping concentration engu-6 mol.% kanye nobubanzi obuphakathi obungu-30 μm (NA = 0.12). Ububanzi obukhulu obuphakathi kwenza i-gain fiber ibe ne-coefficient ephansi engeyona i-linear futhi ingamelana namandla aphezulu aphezulu kanye nokukhishwa kwe-pulse kwamandla amakhulu e-pulse. Zombili iziphetho ze-gain fiber zihlanganiswe ne-AlF3 terminal cap.