Kupambana! Laser ya fiber ya femtosecond yamphamvu kwambiri padziko lonse lapansi ya 3 μm

Kupambana! Mphamvu yayikulu kwambiri padziko lonse lapansi ya 3 μm mid-infraredlaser ya femtosecond fiber

Laser ya ulusiKuti mupeze mphamvu ya laser yapakati pa infrared, gawo loyamba ndikusankha zinthu zoyenera za fiber matrix. Mu ma laser apafupi ndi infrared, quartz glass matrix ndiye chinthu chofala kwambiri cha fiber matrix chomwe chimataya mphamvu zochepa kwambiri, mphamvu yodalirika yamakina komanso kukhazikika kwabwino. Komabe, chifukwa cha mphamvu yayikulu ya phonon (1150 cm-1), ulusi wa quartz sungagwiritsidwe ntchito potumiza laser yapakati pa infrared. Kuti tipeze mphamvu yochepa yotumizira laser yapakati pa infrared, tifunika kusankhanso zinthu zina za fiber matrix zomwe zili ndi mphamvu yochepa ya phonon, monga sulfide glass matrix kapena fluoride glass matrix. Sulfide fiber ili ndi mphamvu yochepa kwambiri ya phonon (pafupifupi 350 cm-1), koma ili ndi vuto lakuti kuchuluka kwa doping sikungawonjezeke, kotero sikoyenera kugwiritsidwa ntchito ngati gain fiber popanga mid-infrared laser. Ngakhale kuti gawo la galasi la fluoride lili ndi mphamvu ya phonon yokwera pang'ono (550 cm-1) kuposa gawo la galasi la sulfide, lingathenso kufalitsa ma laser a mid-infrared okhala ndi ma wavelengths ochepera 4 μm. Chofunika kwambiri, gawo la galasi la fluoride limatha kupeza kuchuluka kwa ma ion doping a rare earth, komwe kungapereke phindu lofunikira popanga laser ya mid-infrared, mwachitsanzo, ulusi wa fluoride ZBLAN wokhwima kwambiri wa Er3+ wakwanitsa kupeza kuchuluka kwa doping mpaka 10 mol. Chifukwa chake, matrix yagalasi ya fluoride ndiye chinthu choyenera kwambiri cha matrix a fiber lasers a mid-infrared.

Posachedwapa, gulu la Pulofesa Ruan Shuangchen ndi Pulofesa Guo Chunyu ku Shenzhen University linapanga femtosecond yamphamvu kwambirilaser ya ulusi wa kugundanaYopangidwa ndi 2.8μm mode-locked Er:ZBLAN fiber oscillator, single-mode Er:ZBLAN fiber preamplifier ndi large-mode fiber amplifier Er:ZBLAN fiber main amplifier.
Kutengera chiphunzitso cha kudzikakamiza ndi kukulitsa mphamvu ya mid-infrared ultra-short pulse yolamulidwa ndi polarization state ndi ntchito yoyeserera manambala ya gulu lathu lofufuza, kuphatikiza njira zoletsa zosagwirizana ndi njira zowongolera njira za large-mode optical fiber, active cooling technology ndi kapangidwe ka amplification ka pampu yokhala ndi ma end awiri, dongosololi limapeza kutulutsa kwa 2.8μm ultra-short pulse ndi mphamvu yapakati ya 8.12W ndi m'lifupi mwa pulse ya 148 fs. Mbiri yapadziko lonse ya mphamvu yapakati yapamwamba kwambiri yomwe gulu lofufuzali lapeza idasinthidwanso.

Chithunzi 1 Chithunzi cha kapangidwe ka Er:ZBLAN fiber laser kutengera kapangidwe ka MOPA
Kapangidwe kalaser ya femtosecondDongosololi likuwonetsedwa pa Chithunzi 1. Ulusi wa Er:ZBLAN wokhala ndi mawonekedwe awiri okhala ndi kutalika kwa 3.1 m unagwiritsidwa ntchito ngati ulusi wopeza mu preamplifier wokhala ndi kuchuluka kwa doping kwa 7 mol.% ndi mainchesi apakati a 15 μm (NA = 0.12). Mu amplifier yayikulu, ulusi wa Er:ZBLAN wokhala ndi mawonekedwe awiri wokhala ndi kutalika kwa 4 m unagwiritsidwa ntchito ngati ulusi wopeza ndi kuchuluka kwa doping kwa 6 mol.% ndi mainchesi apakati a 30 μm (NA = 0.12). Mainchesi akuluakulu apakati amapangitsa ulusi wopeza kukhala ndi coefficient yotsika yopanda mzere ndipo imatha kupirira mphamvu yayikulu ya peak ndi kutulutsa kwa pulse kwa mphamvu yayikulu ya pulse. Malekezero onse awiri a ulusi wopeza amalumikizidwa ku chivundikiro cha terminal cha AlF3.