Laser yotsekedwa ndi mode, laser yothamanga kwambiri yamphamvu

Femtosecond yamphamvu kwambirilaserili ndi phindu lalikulu pa kafukufuku wa sayansi ndi mafakitale monga kupanga terahertz, kupanga attosecond pulse ndi optical frequency comb.Ma laser otsekedwa ndi ModKutengera ndi njira yachikhalidwe yopezera block-gain, ma lensing amachepetsedwa ndi mphamvu ya kutentha pa mphamvu yayikulu, ndipo pakadali pano mphamvu yayikulu yotulutsa ndi pafupifupi 20 W.

Laser yopyapyala imagwiritsa ntchito kapangidwe ka pampu yodutsa zambiri kuti iwonetsenyali ya pampuku sheet gain medium yokhala ndi makulidwe a ma microns 100 kuti igwire bwino ntchito ya pompu. Chomera chocheperako kwambiri chophatikiza ndi ukadaulo woziziritsa kumbuyo chimachepetsa kwambiri mphamvu ya ma lens a kutentha komanso mphamvu yosakhala yolunjika, ndipo chimatha kukwaniritsa mphamvu yayikulu ya femtosecond pulse output.
Ma Wafer oscillator ophatikizidwa ndi ukadaulo wa Kerr lens mode-locking ndiye njira yayikulu yopezera mphamvu yayikulu ya laser yotulutsa ndi pulse width yofanana ndi femtosecond.

Chithunzi 1 (a) Chithunzi 72 cha kapangidwe ka kuwala ndi (b) chithunzi cha thupi cha gawo la pampu

Gulu la ofufuza ochokera ku Chinese Academy of Sciences linapanga ndi kupanga laser ya Kerr lens mode-locked sheet laser kutengera module ya 72-way pump yodzipangira yokha, ndipo linapanga laser ya Kerr lens mode-locked sheet laser yokhala ndi mphamvu yapakati komanso mphamvu ya single pulse ku China.
Kutengera mfundo ya Kerr lens mode-locking ndi kuwerengera mobwerezabwereza kwa ABCD matrix, gulu lofufuza linayamba lafufuza chiphunzitso cha mode-locking cha thin plate Kerr lens mode-locking laser, linayesa kusintha kwa mode mu resonator panthawi ya mode-locking ndi ntchito yopitilira, ndipo linatsimikizira kuti cavity mode radius pa hard diaphragm idzachepetsedwa ndi oposa 7% pambuyo pa mode-locking.

Pambuyo pake, motsogozedwa ndi mfundo ya kapangidwe kake, gulu lofufuza linapanga ndi kupanga resonator ya Kerr lens mode-locked (Chithunzi 2) kutengera 72-way pump module (Chithunzi 1) yomwe idapangidwa payokha ndi gululo, ndipo idapeza pulsed laser output yokhala ndi mphamvu yapakati ya 11.78W, pulse width ya 245 fs ndi single pulse energy ya 0.14μJ pa 72 W pumping time. Kuchuluka kwa output pulse ndi kusintha kwa intracavity mode zikugwirizana bwino ndi zotsatira za simulation.

Chithunzi 2 Chithunzi cha resonant cavity ya Kerr lens mode-locked Yb:YAG wafer laser yomwe idagwiritsidwa ntchito mu kuyeseraku

Pofuna kupititsa patsogolo mphamvu yotulutsa ya laser, gulu lofufuza linawonjezera kutalika kwa galasi loyang'ana, ndipo linakonza makulidwe apakati a Kerr ndi kufalikira kwachiwiri. Pamene mphamvu ya pampu inayikidwa pa 94 ​​W, mphamvu yotulutsa yapakati inawonjezeka kufika pa 22.33 W, ndipo m'lifupi mwa pulse inali 394 fs ndipo mphamvu ya pulse imodzi inali 0.28 μJ.

Kuti awonjezere mphamvu yotulutsa, gulu lofufuza lidzawonjezeranso kutalika kwa curvature ya galasi lolunjika, pomwe likuyika resonator pamalo otsika otsekedwa ndi vacuum kuti achepetse kusokonezeka kwa mpweya ndi kufalikira kwa mpweya.