Laser ɗin takarda mai kullewa a yanayin, Laser mai ƙarfi mai ƙarfi mai sauri

Babban ƙarfin femtosecondlaseryana da matuƙar amfani a binciken kimiyya da fannoni na masana'antu kamar samar da terahertz, samar da bugun jini na attosecond da kuma tsefewar mitar gani.Lasers masu kulle-kullebisa ga kafofin watsa labarai na gargajiya na toshe-riba suna iyakance ta hanyar tasirin ruwan tabarau na zafi a babban iko, kuma a halin yanzu matsakaicin ƙarfin fitarwa shine kusan 20 W.

Laser ɗin takarda mai laushi yana amfani da tsarin famfo mai wucewa da yawa don nuna yanayinhasken famfoMatsakaicin gain ɗin takardar tare da kauri na microns 100 don ingantaccen ɗaukar famfo. Matsakaicin gain mai siriri tare da fasahar sanyaya baya yana rage tasirin tasirin ruwan tabarau na thermal da tasirin mara layi, kuma yana iya samun ƙarfin fitarwa na femtosecond mai ƙarfi.
Wafer oscillators tare da fasahar kulle yanayin ruwan tabarau na Kerr sune manyan hanyoyin samun matsakaicin fitarwa na laser mai ƙarfi tare da faɗin bugun jini a cikin tsari na femtosecond.

FIG. 1 (a) 72 zane na tsarin gani da (b) zane na zahiri na tsarin famfo

Wata ƙungiyar masu bincike daga Kwalejin Kimiyya ta ƙasar Sin ta tsara tare da gina na'urar laser mai kullewa ta fuskar ruwan tabarau ta Kerr bisa tsarin famfo mai hanyoyi 72 da kanta ta ƙirƙira, sannan ta ƙirƙiri na'urar laser mai kullewa ta fuskar ruwan tabarau ta Kerr wacce ke da matsakaicin ƙarfin lantarki da ƙarfin bugun zuciya ɗaya a ƙasar Sin.
Bisa ga ƙa'idar kulle yanayin ruwan tabarau na Kerr da kuma lissafin maimaita ABCD matrix, ƙungiyar binciken ta fara nazarin ka'idar kulle yanayin na farantin bakin ciki na laser ɗin kulle yanayin ruwan tabarau na Kerr, ta kwaikwayi canje-canjen yanayin a cikin resonator yayin aikin kulle yanayin da ci gaba da aiki, kuma ta tabbatar da cewa radius ɗin yanayin rami a diaphragm mai tauri zai ragu da fiye da kashi 7% bayan kulle yanayin.

Daga baya, bisa ga jagorancin ƙa'idar ƙira, ƙungiyar binciken ta tsara kuma ta gina resonator mai kullewa ta ruwan tabarau na Kerr (Hoto na 2) bisa ga tsarin famfo mai hanya 72 (Hoto na 1) wanda ƙungiyar ta haɓaka daban-daban, kuma ta sami fitowar laser mai bugun jini tare da matsakaicin ƙarfin 11.78W, faɗin bugun jini na 245 fs da kuzarin bugun jini guda ɗaya na 0.14μJ a lokacin famfo na 72 W. Faɗin bugun fitarwa da bambancin yanayin cikin ramin sun yi daidai da sakamakon kwaikwayon.

FIG. 2 Zane mai tsari na ramin resonant na laser wafer Yb:YAG da aka kulle a yanayin ruwan tabarau na Kerr da aka yi amfani da shi a gwajin

Domin inganta ƙarfin fitarwa na laser, ƙungiyar masu binciken ta ƙara radius na lanƙwasa na madubin mai da hankali, kuma ta daidaita kauri matsakaici na Kerr da watsawa na biyu. Lokacin da aka saita ƙarfin famfo zuwa 94 W, matsakaicin ƙarfin fitarwa an ƙara zuwa 22.33 W, kuma faɗin bugun jini shine 394 fs kuma ƙarfin bugun jini ɗaya shine 0.28 μJ.

Domin ƙara ƙarfin fitarwa, ƙungiyar bincike za ta ƙara ƙara radius na lanƙwasa na madubin concave mai mayar da hankali, yayin da za ta sanya resonator a cikin yanayin rufewa mai ƙarancin iska don rage tasirin tasirin iska da watsawar iska.