I-laser yeshidi ekhiyiwe ngendlela, i-laser enamandla aphezulu kakhulu esheshayo

I-femtosecond enamandla aphezului-laserinenani elikhulu lokusetshenziswa ocwaningweni lwesayensi kanye nasemasimini ezimboni njengokukhiqiza i-terahertz, ukukhiqiza i-attosecond pulse kanye ne-optical frequency comb.Ama-laser akhiyiwe nge-ModNgokusekelwe kumidiya yendabuko yokuzuza i-block, kunqunyelwe umphumela we-thermal lensing kumandla aphezulu, futhi okwamanje amandla aphezulu okukhipha angaba ngu-20 W.

I-laser yeshidi elincane isebenzisa isakhiwo sephampu esidlula ama-multi-pass ukuze iboniseisibani sephampuku-sheet gain medium enobukhulu obungama-microns ayi-100 ukuze kufakwe ipompo kahle kakhulu. I-gain medium encane kakhulu ehlanganiswe nobuchwepheshe bokupholisa emuva inciphisa kakhulu ithonya lomphumela welensi yokushisa kanye nomphumela ongewona owe-linear, futhi ingafinyelela umphumela we-femtosecond pulse onamandla aphezulu.
Ama-oscillator e-Wafer ahlanganiswe nobuchwepheshe be-Kerr lens mode-locking ayindlela eyinhloko yokuthola amandla aphezulu okukhipha i-laser enobubanzi be-pulse ngokulandelana kwe-femtosecond.

UMFANELO 1 (a) umdwebo wesakhiwo se-optical ongu-72 kanye (b) umdwebo obonakalayo wemojuli yepompo

Ithimba labacwaningi abavela e-Chinese Academy of Sciences baklame futhi bakha i-laser yeshidi le-Kerr mode-locked sheet ngokusekelwe kumoduli yephampu yezindlela ezingu-72 ethuthukiswe ngokwayo, futhi baklama i-laser yeshidi le-Kerr mode-locked sheet enamandla aphakathi nendawo kanye namandla okushaya okukodwa eShayina.
Ngokusekelwe esimisweni sokukhiya imodi yelensi ye-Kerr kanye nokubalwa okuphindaphindiwe kwe-ABCD matrix, ithimba locwaningo liqale lahlaziya inkolelo-mbono yokukhiya imodi ye-thin plate Kerr lens mode-locking laser, lalinganisa izinguquko zemodi ku-resonator ngesikhathi sokusebenza kokukhiya imodi kanye nokusebenza okuqhubekayo, futhi laqinisekisa ukuthi i-cavity mode radius ku-hard diaphragm izoncishiswa ngaphezu kuka-7% ngemva kokukhiya imodi.

Ngemva kwalokho, beqondiswa umgomo wokuklama, ithimba locwaningo laklama futhi lakha i-resonator ye-Kerr lens mode-locked (FIG. 2) ngokusekelwe kumoduli yephampu yezindlela ezingu-72 (FIG.1) eyathuthukiswa ngokuzimela yithimba, futhi lathola umkhiqizo we-laser oshukunyiswa ngamandla aphakathi angu-11.78W, ububanzi be-pulse obungu-245 fs kanye namandla e-pulse eyodwa angu-0.14μJ ngesikhathi sokupompa esingu-72 W. Ububanzi be-pulse yokukhipha kanye nokwehluka kwemodi ye-intracavity kuvumelana kahle nemiphumela yokulingisa.

UMFANELO 2 Umdwebo weskimu wesikhala esizwakalayo se-Kerr lens mode-locked Yb:YAG wafer laser esetshenziswe ekuhlolweni

Ukuze kuthuthukiswe amandla okukhipha e-laser, ithimba locwaningo landise i-radius yokugoba yesibuko esigxilile, futhi lalungisa kahle ubukhulu obuphakathi be-Kerr kanye nokusabalala kwe-second-order. Lapho amandla ephampu esethwe ku-94 W, amandla okukhipha ajwayelekile akhushulwa afinyelela ku-22.33 W, kanti ububanzi be-pulse babungu-394 fs kanti amandla e-single pulse ayengu-0.28 μJ.

Ukuze kwandiswe amandla okukhipha, ithimba locwaningo lizokwandisa irediyasi yokugoba yesibuko esigobile esigxilile, ngenkathi libeka i-resonator endaweni ephansi evaliwe nge-vacuum ukuze kuncishiswe ithonya lokuphazamiseka komoya kanye nokusabalala komoya.