Nasara! Laser mafi ƙarfi a duniya na 3 μm na tsakiyar infrared femtosecond fiber

Nasara! Mafi girman ƙarfi a duniya 3 μm tsakiyar infraredLaser ɗin fiber na femtosecond

Laser ɗin fiberDomin cimma matsakaicin fitarwa na laser mai infrared, mataki na farko shine a zaɓi kayan fiber matrix da ya dace. A cikin lasers na fiber mai infrared, matrix na gilashin quartz shine kayan fiber matrix da aka fi sani da ƙarancin asarar watsawa, ƙarfin injiniya mai inganci da kwanciyar hankali mai kyau. Duk da haka, saboda yawan kuzarin phonon (1150 cm-1), ba za a iya amfani da fiber quartz don watsa laser mai infrared ba. Domin cimma ƙarancin asarar watsa laser mai infrared, muna buƙatar sake zaɓar wasu kayan fiber matrix masu ƙarancin kuzarin phonon, kamar su gilashin sulfide matrix ko matrix na gilashin fluoride. Fiber na sulfide yana da mafi ƙarancin kuzarin phonon (kimanin 350 cm-1), amma yana da matsala cewa ba za a iya ƙara yawan doping ba, don haka bai dace da amfani da shi azaman fiber mai gain don samar da laser mai infrared ba. Duk da cewa gilashin fluoride yana da ɗan ƙarfin phonon (550 cm-1) fiye da gilashin sulfide, yana kuma iya samun ƙarancin watsawa ga lasers masu matsakaicin infrared tare da raƙuman ruwa ƙasa da μm 4. Mafi mahimmanci, gilashin fluoride na iya samun babban yawan ion na earth doping, wanda zai iya samar da ribar da ake buƙata don samar da laser mai matsakaicin infrared, misali, mafi girman zaren fluoride ZBLAN don Er3+ ya sami damar cimma yawan doping har zuwa 10 mol. Saboda haka, matrix gilashin fluoride shine kayan fiber matrix mafi dacewa don lasers na tsakiyar infrared fiber.

Kwanan nan, ƙungiyar Farfesa Ruan Shuangchen da Farfesa Guo Chunyu a Jami'ar Shenzhen sun ƙirƙiro na'urar auna ƙarfin lantarki mai ƙarfi ta femtosecondLaser na fiber na bugun jiniwanda ya ƙunshi na'urar oscillator mai kulle yanayin 2.8μm, na'urar preamplifier mai siffar Er:ZBLAN da kuma babban filin amplifier mai siffar Er:ZBLAN.
Dangane da ka'idar matsawa da haɓakawa ta bugun tsakiyar infrared mai gajeren lokaci wanda ke sarrafawa ta hanyar yanayin polarization da aikin kwaikwayo na lambobi na ƙungiyar bincikenmu, tare da hanyoyin hanawa mara layi da hanyoyin sarrafa yanayin fiber na gani mai girma, fasahar sanyaya mai aiki da tsarin haɓaka famfo mai ƙarewa biyu, tsarin yana samun fitowar bugun 2.8μm mai gajeren lokaci tare da matsakaicin ƙarfin 8.12W da faɗin bugun 148 fs. An ƙara sabunta rikodin ƙasa da ƙasa na matsakaicin matsakaicin ƙarfi da wannan ƙungiyar bincike ta samu.

Hoto na 1 Tsarin zane na laser ɗin zare na Er:ZBLAN bisa tsarin MOPA
TsarinLaser na fettosecondAn nuna tsarin a Hoto na 1. An yi amfani da zare mai siffar Er:ZBLAN mai tsayin mita 3.1 mai siffar gain a cikin preamplifier tare da yawan doping na 7 mol.% da diamita na tsakiya na 15 μm (NA = 0.12). A cikin babban amplifier, an yi amfani da babban filin yanayin Er:ZBLAN mai tsayin mita 4 a matsayin zaren gain tare da yawan doping na 6 mol.% da diamita na tsakiya na 30 μm (NA = 0.12). Babban diamita na tsakiya yana sa zaren gain yana da ƙarancin ma'aunin da ba na layi ba kuma yana iya jure ƙarfin kololuwa mafi girma da fitowar bugun jini na babban kuzarin bugun jini. An haɗa ƙarshen zaren gain zuwa murfin tashar AlF3.