Ndị otu Free electron Laser nke Chinese Academy of Sciences enweela ọganihu n'inyocha nke free electron lasers zuru oke. Dabere na Shanghai Soft X-ray Free Electron Laser Facility, a chọpụtala usoro ọhụrụ nke echo harmonic cascade free electron laser nke China tụrụ aro nke ọma, enwetakwala radieshon X-ray dị nro nke nwere arụmọrụ dị mma. N'oge na-adịbeghị anya, ebipụtara nsonaazụ ya na Optica n'okpuru aha Coherent na ultra-short soft X-ray pulses sitere na echo-enabled harmonic cascade free electron lasers.
Laser elektrọn nke na-enweghị X-ray bụ otu n'ime isi iyi ọkụ kachasị elu n'ụwa. Ugbu a, ọtụtụ n'ime laser elektrọn X-ray mba ụwa dabere na usoro mwepụ onwe onye na-eme ka ihe na-esi na ya pụta (SASE), SASE nwere oke ọkụ dị elu na obosara pulse dị mkpụmkpụ na arụmọrụ ndị ọzọ dị mma, mana mkpọtụ SASE site na mkpọtụ, njikọ na nkwụsi ike nke pulse radieshon ya adịghị elu, ọ bụghị "laser" X-ray band. Otu n'ime ntuziaka mmepe kachasị mkpa n'ọhịa nke laser elektrọn efu mba ụwa bụ ịmepụta radieshon X-ray zuru oke na mma laser nkịtị, ụzọ dị mkpa bụ iji usoro ọrụ laser elektrọn efu mpụta. Radieshon nke laser elektrọn efu mpụta na-eketa njirimara nke laser mkpụrụ, ma nwee njirimara dị mma dịka njikọ zuru oke, njikwa usoro na mmekọrịta ziri ezi na laser mgbapụta mpụta. Agbanyeghị, n'ihi mmachi nke ebili mmiri na obosara pulse nke laser mkpụrụ, mkpuchi ogologo ogologo na oke nhazi pulse nke laser elektrọn efu mpụta nwere oke. Iji gbasaa mkpuchi ogologo oge nke laser elektrọn na-enweghị mkpụrụ mpụta, a na-emepe usoro ọrụ laser elektrọn ọhụrụ n'efu dịka mmepụta echo harmonic n'ụwa n'afọ ndị na-adịbeghị anya.
Laser elektrọn nke na-enweghị mkpụrụ bụ otu n'ime ụzọ teknụzụ isi emepụta laser elektrọn nke na-enweghị mkpụrụ na China. Ugbu a, ngwaọrụ laser elektrọn anọ niile dị elu na China ewerela ụdị ọrụ mkpụrụ mpụta. Dabere na Shanghai Deep Ultraviolet Electronic Laser Facility na Shanghai Soft X-ray Free Electron Laser Facility, ndị ọkà mmụta sayensị enwetala nkwalite ọkụ elektrọn laser elektrọn nke mbụ na-enweghị mkpụrụ na mgbakwunye ultraviolet na mgbakwunye saturation electron laser elektrọn nke na-enweghị mkpụrụ na-enweghị mkpụrụ. Iji kwalite laser elektrọn nke na-enweghị mkpụrụ ruo na obere ogologo oge, ndị otu nyocha ahụ tụpụtara n'onwe ha usoro ọhụrụ nke laser elektrọn nke na-enweghị mkpụrụ na-enweghị mkpụrụ na cascade echo harmonic, nke ngwaọrụ Shanghai Soft X-ray electron Laser nakweere dị ka atụmatụ bụ isi, ma mechaa usoro ahụ dum site na nkwenye isi ruo na mmụba ọkụ na eriri X-ray dị nro. Nsonaazụ nyocha ahụ gosiri na ma e jiri ya tụnyere usoro ịgba ọsọ ụdị mkpụrụ mpụta ọdịnala, usoro a nwere njirimara spectral dị oke mma, site na nnabata nke ndị nchọpụta nke mmepe onwe onye nke teknụzụ nchọpụta pulse X-ray ultrafast (https://doi.org/10.1016/j.fmre.2022.01.027), arụmọrụ dị elu nke usoro ọhụrụ a na njikwa ogologo pulse na mmepụta pulse ultrafast ka a na-enyocha. Nsonaazụ nyocha dị mkpa na-enye ụzọ teknụzụ enwere ike iji mepụta laser elektrọn n'efu zuru oke na band subnanometer, ma ga-enye ngwaọrụ nyocha zuru oke maka ubi nke optics X-ray nonlinear na kemistri anụ ahụ ultrafast.
Laser elektrọn echo harmonic cascade free nwere arụmọrụ spectral dị mma: onyonyo aka ekpe bụ ọnọdụ cascade nkịtị, onyonyo aka nri bụkwa ọnọdụ cascade echo harmonic
Enwere ike ime mgbanwe ogologo mkpali X-ray na mmepụta mkpali ngwa ngwa site na echo harmonic cascade
Oge ozi: Ọktoba-08-2023