Ithimba le-Free electron Laser le-Chinese Academy of Sciences lenze intuthuko ocwaningweni lwama-laser e-electron akhululekile ahambisana ngokuphelele. Ngokusekelwe ku-Shanghai Soft X-ray Free Electron Laser Facility, indlela entsha ye-echo harmonic cascade free electron laser ephakanyiswe yiShayina iqinisekiswe ngempumelelo, futhi imisebe ethambile ye-X-ray coherent esebenza kahle kakhulu itholakele. Muva nje, imiphumela ishicilelwe ku-Optica ngaphansi kwesihloko esithi Coherent and ultra-short soft X-ray pulses from echo-enabled harmonic cascade free electron lasers.
I-laser yama-electron angenama-X-ray ingenye yemithombo yokukhanya ethuthuke kakhulu emhlabeni. Njengamanje, iningi lama-laser ama-electron angenama-X-ray angaphandle asekelwe ku-self-amplifying spontaneous emission mechanism (SASE), i-SASE inokukhanya okuphezulu kakhulu kanye nobubanzi be-pulse obufushane kakhulu kanye nokunye ukusebenza okuhle kakhulu, kodwa ukudlidliza kwe-SASE ngomsindo, ukuhambisana kanye nokuqina kwe-radiation pulse yayo akuphakeme, akuyona i-X-ray band "laser". Enye yezinkomba ezibaluleke kakhulu zentuthuko emkhakheni we-laser yama-electron angaphandle amahhala ukukhiqiza imisebe ye-X-ray ehambisanayo ngokugcwele nekhwalithi ye-laser evamile, futhi indlela ebalulekile ukusebenzisa indlela yokusebenza ye-external seed free electron laser. Imisebe ye-external seed free electron laser izuza izici ze-seed laser, futhi inezici ezinhle kakhulu ezifana nokuhambisana okugcwele, ukulawula isigaba kanye nokuvumelanisa okunembile ne-external pump laser. Kodwa-ke, ngenxa yomkhawulo we-wavelength kanye nobubanzi be-pulse ye-seed laser, ukumbozwa kwe-wavelength emfushane kanye nobubanzi bokulungiswa kwe-pulse ye-external seed free electron laser kunqunyelwe. Ukuze kwandiswe kabanzi ukumbozwa kobude obufushane be-laser yangaphandle engenambewu, izindlela ezintsha zokusebenza kwe-laser yamahhala efana nokukhiqizwa kwe-echo harmonic ziyathuthukiswa ngamandla emhlabeni eminyakeni yamuva nje.
I-laser yangaphandle engenambewu ingenye yezindlela zobuchwepheshe eziyinhloko zokuthuthukisa i-laser ye-electron engenanzuzo ephezulu eShayina. Njengamanje, wonke amadivayisi amane e-laser engenanzuzo ephezulu eShayina asesebenzise imodi yokusebenza kwembewu yangaphandle. Ngokusekelwe kwi-Shanghai Deep Ultraviolet Free electron Laser Facility kanye ne-Shanghai Soft X-ray Free Electron Laser Facility, ososayensi baphumelele ngokulandelana ekukhuliseni ukukhanya kwe-laser ye-echo type free electron yokuqala yamazwe ngamazwe kanye ne-extreme ultraviolet echo type free electron laser saturation amplification yokuqala. Ukuze kuthuthukiswe i-laser yangaphandle engenambewu ibe yi-short wavelength, ithimba locwaningo liphakamise ngokuzimela indlela entsha ye-laser yamahhala egcwele i-electron ene-echo harmonic cascade, eyamukelwa yidivayisi ye-Shanghai Soft X-ray Free electron Laser njengohlelo oluyisisekelo, futhi yaqeda yonke inqubo kusukela ekuqinisekisweni okuyisisekelo kuya ekukhuliseni ukukhanya ebhendini le-X-ray elithambile. Imiphumela yocwaningo ikhombisa ukuthi uma kuqhathaniswa nendlela yokusebenza yendabuko yohlobo lwembewu yangaphandle, le ndlela inezici ezinhle kakhulu ze-spectral, ngokwamukelwa kwabacwaningi kokuthuthukiswa okuzimele kobuchwepheshe bokuxilongwa kwe-pulse ye-X-ray ye-ultrafast (https://doi.org/10.1016/j.fmre.2022.01.027), Ukusebenza okuphezulu kwale ndlela entsha ekulawuleni ubude be-pulse kanye nokukhiqizwa kwe-pulse ye-ultrafast kuqinisekiswa ngokwengeziwe. Imiphumela yocwaningo efanele inikeza indlela yobuchwepheshe engenzeka yokukhiqiza ama-laser e-electron akhululekile ahambisana ngokugcwele ku-subnanometer band, futhi izohlinzeka ngethuluzi locwaningo elifanele lemikhakha ye-X-ray nonlinear optics kanye ne-ultrafast physical chemistry.
I-laser yama-electron yamahhala ye-echo harmonic cascade isebenza kahle kakhulu: isithombe sesobunxele yimodi ye-cascade evamile, kanti isithombe sesokudla yimodi ye-echo harmonic cascade.
Ukulungiswa kobude be-pulse ye-X-ray kanye nokukhiqizwa kwe-pulse okusheshayo kungatholakala nge-echo harmonic cascade
Isikhathi sokuthunyelwe: Okthoba-08-2023