Laser-wake-field acceleration (LWFA) yog ib qho tseem ceeb txhais tau tias ntawm acceleration uas txawv nws los ntawm cov pa RF acceleration ntawm hais.LWFA muaj peev xwm tsim acceleration gradients ntawm GeV / cm, uas yuav tsum tau txo qhov luaj li cas thiab tus nqi ntawm cov roj pedals thiab pab. brachytherapy.LWFA converts LWFA converts lub teeb lub zog ntawm ib tug laser mem tes rau hauv lub kinetic zog ntawm lub accelerated electrons. Lub zog hluav taws xob xav tau rau kev siv kho mob yog kaum rau ntau pua ntawm keV, sib haum rau lub laser tsom siv ntawm 1014 W / cm2 lossis ntau dua, thiab yog tias qhov tsom mus rau txoj kab uas hla yog 20 μm, lub zog laser siab xav tau mus txog qib gigawatt.
Hauv qhov teeb meem no, tsab xov xwm tshuaj xyuas luam tawm xyoo 2022 [1] tau nthuav tawm los tham txog cov thev naus laus zis fiber ntau laser thiab muaj zog pulse xa tshuab xav tau rau LWFA rau kev kho mob qog noj ntshav. Nyob rau hauv endoscopic LWFA raws li qhia nyob rau hauv daim duab 1, high-power femtosecond pulses excite solid-state carbon nanotubes, thiab laser wake field yog nyob rau ntawm ib tug siab ceev ntawm LWFA, qhov twg electrons yuav tsum tau ceev mus rau kaum rau pua pua ntawm keV, uas yog txaus rau rhuav tshem cov qog nqaij hlav cancer yam tsis muaj kev puas tsuaj rau cov nqaij mos.
Nyob rau hauv ultrafast fiber ntau lasers, lub teeb liab lub teeb thiab lub teeb twj tso kua mis yog kis tau nyob rau hauv lub fiber raws li kev taw qhia yoj nrog kev ua haujlwm ntev, uas, ua ke nrog rau qhov siab-rau-ntim piv ntawm cov fiber ntau, ua rau nws yooj yim dua los txhawb lub zog nruab nrab ntawm lub zog. fiber ntau laser. Lub siab ncov lub zog ultrafast fiber ntau laser tshuab feem ntau ntiav tus tswv-oscillator-power-amplifier (MOPA) architecture, uas lub ultrafast fiber oscillator muab cov noob pulses ruaj khov hauv femtosecond lossis picosecond ntau yam. Txhawm rau daws cov teeb meem ntawm kev tsis sib xws thiab cov khoom puas tsuaj, lub zog loj ultrafast fiber ntau lasers feem ntau siv chirped-pulse amplification (CPA) technology thiab loj hom cheeb tsam (LMA) fibers.
Lub zog siab tshaj plaws ntawm lub laser yog nce los ntawm kaum lossis ntau pua megawatts mus rau qib gigawatt. Cov ntsiab lus xiav daim duab peb sab nyob ib puag ncig ntawm txoj kab siv ze ze 10 GW / cm2, cuam tshuam cov kev txwv tsis pub dhau los ntawm cov theem tsis sib xws. Txhawm rau kom ua tiav lub zog siab dua, cov kab sib txuas sib txuas (CBC) ntawm ntau lub tshuab hluav taws xob ultrafast fiber ntau tuaj yeem siv.
Hauv kev siv endoscopic, lub hollow-core fiber tuaj yeem siv los ua cov channel hloov pauv kom xa cov laser pulses ntawm gigawatt ncov lub zog rau LWFA ntaus ntawv ze ntawm qhov chaw kho mob. Nyob rau hauv cov ntaub ntawv no, lub optical mem tes propagates mas nyob rau hauv cov huab cua core, mitigating qhov teeb meem ntawm cov khoom puas, thaum ob qho tib si nonlinearity thiab dispersion yog heev txo. Air-core fibers nrog hom-field txoj kab uas hla (MFD) ntawm 40 μm thiab khoov vojvoog ntawm 25 cm tau pom tias kis tau cov pulses nrog qhov dav ntawm 500 fs, lub zog ntawm 500 μJ, thiab lub siab tshaj plaws ntawm 1 GW. .In 2016, Mattia Michieletto et al. tau npaj ib qho tshiab anti-resonant air-core fiber (ntev ntawm 5 m, nrog rau MFD ntawm txog 22 μm thiab khoov vojvoog ntawm 16 cm), muaj peev xwm kis tau picosecond pulses nrog lub zog nruab nrab txog li 70 W ntawm qhov poob qis.
Hauv kev xaus, kev tsim kho sai ultrafast fiber ntau laser tshuab muaj peev xwm xa cov pulses femtosecond nrog gigawatt ncov zog rau LWFA, thiab hollow-core fibers muaj peev xwm kis tau xws li ultrashort thiab ultra-powerful pulses. Kev sib xyaw ua ke ntawm ob lub thev naus laus zis no yuav tsum ua kom muaj qhov ceev LWFA-raws li kev kho mob qog noj ntshav endoscopic yav tom ntej.
