Kupambana! Mphamvu yapamwamba kwambiri padziko lonse lapansi 3 μm pakati pa infrared femtosecond fiber laser

Kupambana! Mphamvu zapamwamba kwambiri padziko lonse lapansi 3 μm pakati pa infraredFemtosecond fiber laser

Fiber laserkuti mukwaniritse zotulutsa zapakatikati mwa infrared laser, choyambira ndikusankha zinthu zoyenera za fiber masanjidwewo. Mu ma lasers apafupi ndi infrared fiber, quartz glass matrix ndiye chinthu chodziwika bwino cha fiber matrix chomwe chimakhala ndi kutayika kochepa kwambiri, mphamvu zamakina odalirika komanso kukhazikika kwabwino kwambiri. Komabe, chifukwa cha mphamvu ya phonon yapamwamba (1150 cm-1), quartz fiber singagwiritsidwe ntchito kufalitsa pakati pa infrared laser. Kuti tikwaniritse kutayika kochepa kwa laser yapakati pa infrared, tiyenera kusankhanso zida zina za fiber matrix zokhala ndi mphamvu yotsika ya phonon, monga matrix a sulfide glass matrix kapena fluoride glass matrix. Ulusi wa sulfide uli ndi mphamvu yotsika kwambiri ya phonon (pafupifupi 350 cm-1), koma ili ndi vuto loti ndende ya doping silingachulukitsidwe, chifukwa chake sizoyenera kugwiritsidwa ntchito ngati chiwongola dzanja chopanga laser yapakatikati. Ngakhale gawo lapansi lagalasi la fluoride lili ndi mphamvu ya phonon yokwera pang'ono (550 cm-1) kuposa gawo lapansi lagalasi la sulfide, imathanso kufalitsa kutayika kochepa kwa ma laser apakati a infrared okhala ndi mafunde osakwana 4 μm. Chofunika koposa, gawo lapansi lagalasi la fluoride limatha kukwaniritsa kuchuluka kwa ma ion doping padziko lapansi, omwe angapereke phindu lofunikira pakubadwa kwa laser yapakatikati, mwachitsanzo, ulusi wokhwima kwambiri wa fluoride wa ZBLAN wa Er3 + watha kukwaniritsa kuchuluka kwa doping. mpaka 10 mol. Chifukwa chake, matrix agalasi a fluoride ndiye chinthu choyenera kwambiri cha fiber matrix chapakati pa infrared fiber lasers.

Posachedwapa, gulu la Pulofesa Ruan Shuangchen ndi Pulofesa Guo Chunyu ku yunivesite ya Shenzhen anapanga femtosecond yamphamvu kwambiri.pulse fiber laserwopangidwa ndi 2.8μm mode-locked Er: ZBLAN fiber oscillator, single-mode Er: ZBLAN fiber preamplifier ndi gawo lalikulu-mode Er: ZBLAN fiber main amplifier.
Kutengera chiphunzitso chodzipanikiza komanso chokulitsa chapakati pa infrared ultra-short pulse motsogozedwa ndi polarization state ndi ntchito yofananira yowerengera ya gulu lathu lofufuza, kuphatikiza kuponderezana kosagwirizana ndi njira zowongolera zamitundu yayikulu yama fiber optical, ukadaulo woziziritsa komanso kukulitsa. Kapangidwe ka mpope wokhala ndi mbali ziwiri, kachitidwe kameneka kamapeza 2.8μm kopitilira muyeso wamfupi ndi mphamvu yapakati ya 8.12W ndi kugunda kwa 148 fs. Mbiri yapadziko lonse ya mphamvu zapamwamba kwambiri zomwe gulu la kafukufukuyu linapeza zinatsitsimutsidwanso.

Chithunzi 1 Chojambula cha Er: ZBLAN fiber laser yochokera ku MOPA
Mapangidwe alaser femtoseconddongosolo likuwonetsedwa mu Chithunzi 1. Er-mode-mode double-clad Er: ZBLAN fiber ya 3.1 m kutalika inagwiritsidwa ntchito monga phindu la fiber mu preamplifier ndi doping concentration ya 7 mol.% ndi core diameter ya 15 μm (NA = 0.12; Mu amplifier yayikulu, gawo lalikulu lamitundu iwiri Er: ZBLAN fiber yokhala ndi kutalika kwa 4 m idagwiritsidwa ntchito ngati chiwongola dzanja cha 6 mol.% ndi mainchesi apakati a 30 μm (NA = 0.12). Kukula kokulirapo kwapakati kumapangitsa kuti fiber yopindula ikhale yotsika kwambiri yopanda mzere ndipo imatha kupirira nsonga zapamwamba komanso kutulutsa kwamphamvu kwamphamvu yakugunda kwamphamvu. Mapeto onse a fiber fiber amaphatikizidwa ku kapu ya AlF3 terminal.