Kuye kwenziwa inkqubela phambili kuphononongo lwe-laser ye-electron ekhululekileyo ehambelana ngokupheleleyo

Iqela le-Free electron Laser le-Chinese Academy of Sciences lenze inkqubela phambili kuphando lwee-electron lasers ezikhululekileyo ezihlangeneyo ngokupheleleyo. Ngokusekelwe kwiShanghai Soft X-ray Free Electron Laser Facility, indlela entsha ye-echo harmonic cascade free electron laser ecetywayo yiTshayina iqinisekiswe ngempumelelo, kwaye i-soft X-ray coherent radiation enentsebenzo egqwesileyo ifunyenwe. Kutshanje, Iziphumo zipapashwe kwi-Optica phantsi kwesihloko esithi Coherent and ultra-short soft X-ray pulses from echo-enabled harmonic cascade free electron lasers.

I-laser ye-electron engena-X-ray yenye yezona mithombo zokukhanya ziphambili kwihlabathi. Okwangoku, uninzi lwee-laser ze-electron ezingena-X-ray zamazwe ngamazwe zisekelwe kwindlela yokukhupha umoya ezikhulisayo (SASE), i-SASE inokukhanya okuphezulu kakhulu kunye nobubanzi be-pulse obufutshane kakhulu kunye nokunye ukusebenza okugqwesileyo, kodwa ukungcangcazela kwe-SASE ngengxolo, ukuhambelana kunye nokuzinza kwe-radiation pulse yayo akuphezulu, ayisiyo "laser" yebhendi ye-X-ray. Enye yezona ndlela zibalulekileyo zophuhliso kwicandelo le-laser ye-electron engena-X kukuvelisa i-X-ray radiation ehambelanayo ngokupheleleyo nomgangatho we-laser eqhelekileyo, kwaye indlela ebalulekileyo kukusebenzisa indlela yokusebenza ye-laser engena-seed electron yangaphandle. I-radiation ye-laser engena-seed yangaphandle ifumana iimpawu ze-laser yembewu, kwaye ineempawu ezintle ezifana nokuhambelana ngokupheleleyo, ulawulo lwesigaba kunye nokuvumelanisa ngokuchanekileyo ne-laser yepompo yangaphandle. Nangona kunjalo, ngenxa yokuthintelwa kobude be-wavelength kunye nobubanzi be-pulse ye-laser yembewu, ukugubungela ubude be-wavelength obufutshane kunye noluhlu lokulungiswa kobude be-pulse ye-laser engena-seed yangaphandle kunqongophele. Ukuze kwandiswe ngakumbi ukugubungela ubude obufutshane be-laser yangaphandle engenambewu ye-electron, iindlela ezintsha zokusebenza kwe-laser yasimahla ye-electron ezifana nokuveliswa kwe-echo harmonic ziyaphuhliswa ngamandla kwihlabathi kwiminyaka yakutshanje.

I-laser yangaphandle engenambewu yenye yezona ndlela ziphambili zobugcisa zokuphuhlisa i-laser ye-electron engenanzuzo e-high gain eTshayina. Okwangoku, zonke izixhobo ezine ze-laser ye-electron engenanzuzo e-high gain eTshayina ziye zamkela imo yokusebenza kwembewu yangaphandle. Ngokusekelwe kwiShanghai Deep Ultraviolet Free Electron Laser Facility kunye neShanghai Soft X-ray Free Electron Laser Facility, izazinzulu ziye zaphumelela ngokulandelelana i-echo type free electron laser amplification yokuqala yamazwe ngamazwe kunye ne-extreme ultraviolet echo type free electron laser saturation amplification yokuqala. Ukuze kukhuthazwe ngakumbi i-external seed free electron laser ukuya kwi-short wavelength, iqela lophando licebise ngokuzimeleyo indlela entsha ye-fullly coherent free electron laser ene-echo harmonic cascade, eyamkelwa sisixhobo seShanghai Soft X-ray Free electron Laser njengeskimu esisisiseko, kwaye yagqiba yonke inkqubo ukusuka ekuqinisekisweni okusemgangathweni ukuya ekukhuliseni ukukhanya kwi-soft X-ray band. Iziphumo zophando zibonisa ukuba xa kuthelekiswa nendlela yokusebenza yemveli yohlobo lwembewu yangaphandle, le ndlela ineempawu ezibalaseleyo ze-spectral, ngokwamkelwa kwabaphandi bophuhliso oluzimeleyo lwetekhnoloji yokuxilonga i-pulse ye-X-ray ekhawulezayo (https://doi.org/10.1016/j.fmre.2022.01.027), Ukusebenza okuphezulu kwale ndlela intsha kulawulo lobude be-pulse kunye nokuveliswa kwe-pulse ekhawulezayo kuqinisekisiwe ngakumbi. Iziphumo zophando ezifanelekileyo zibonelela ngendlela yobugcisa enokwenzeka yokuveliswa kwee-laser ze-electron zasimahla ezihambelana ngokupheleleyo kwi-subnanometer band, kwaye ziya kubonelela ngesixhobo sophando esifanelekileyo kwiindawo ze-X-ray nonlinear optics kunye ne-ultrafast physical chemistry.

I-echo harmonic cascade free electron laser isebenza kakuhle kakhulu kwi-spectral: umfanekiso wasekhohlo yimo ye-cascade eqhelekileyo, kwaye umfanekiso wasekunene yimo ye-echo harmonic cascade.

Uhlengahlengiso lobude bepulse ye-X-ray kunye nokuveliswa kwepulse ekhawulezayo kunokufezekiswa yi-echo harmonic cascade