Ọkụ a na-ahụ anya nke ọma n'okpuru afọ iri abụọ na abụọ nke femtosekọndisi iyi laser pulsed a na-emegharị emegharị
N'oge na-adịbeghị anya, otu ndị nyocha si UK bipụtara otu nnyocha ọhụrụ, na-ekwupụta na ha emepụtala ihe ngosi ọkụ a na-ahụ anya nke nwere ike ịgbanwe agbanwe nke nwere ike ịgbanwe agbanwe nke dị n'okpuru 20 femtosecond femtosecond.isi iyi laser pulsedIsi iyi laser a na-akpali akpali, nke dị oke ọsọeriri laserSistemụ ahụ nwere ike imepụta mkpụkọ ọkụ nwere ogologo ebili mmiri a na-agbanwe agbanwe, oge dị mkpụmkpụ, ike dị elu ruo nanojoules 39, na ike kachasị elu karịrị megawatts 2, na-emepe ohere ngwa ọhụrụ maka ubi dịka spectroscopy ultrafast, onyonyo bayọlọji, na nhazi ụlọ ọrụ.
Isi ihe dị mkpa na teknụzụ a bụ njikọta nke ụzọ abụọ dị elu: "Gain-Managed nonlinear Amplification (GMNA)" na "Resonant Dispersive Wave (RDW) emission". N'oge gara aga, iji nweta ụdị ultrashshort pulses dị oke arụmọrụ, a na-achọkarị laser titanium-sapphire ma ọ bụ amplifiers optical parametric dị oke ọnụ ma dị mgbagwoju anya. Ngwaọrụ ndị a abụghị naanị ọnụ ahịa, buru ibu, ma sie ike idobe, kamakwa ha na-ejedebe site na obere ọnụego ugboro ugboro na oke nhazi. Ngwọta eriri niile nke emepụtara n'oge a abụghị naanị na ọ na-eme ka usoro sistemụ dị mfe nke ukwuu kamakwa ọ na-ebelata ọnụ ahịa na mgbagwoju anya nke ukwuu. Ọ na-enye ohere ka mmepụta kpọmkwem nke sub-20 femtosekọnd, nke a na-agbanwe ruo nanomita 400 ruo 700 na gafere pulses ike dị elu na ugboro ugboro ugboro nke 4.8 MHz. Ndị otu nyocha ahụ nwetara ọganihu a site na usoro nhazi nke a haziri nke ọma. Nke mbụ, ha jiri oscillator eriri ytterbium nke na-echekwa polarization kpamkpam dabere na enyo mgbanaka nonlinear amplification (NALM) dị ka isi iyi mkpụrụ. Nhazi a abụghị naanị na ọ na-eme ka sistemụ ahụ kwụsie ike ogologo oge, kamakwa ọ na-ezere nsogbu mmebi nke ihe ndị na-amịkọrọ anụ ahụ. Mgbe emechara ka ọ dị elu ma kpachie pulse, a na-ewebata mkpụrụ osisi n'ime ọkwa GMNA. GMNA na-eji mgbanwe onwe onye na nkesa uru asymmetric longitudinal na eriri anya iji nweta mgbasa spectral ma mepụta pulses ultrashort nwere obere chirp linear zuru oke, nke a na-eme ka ọ dị obere ruo femtosekọnd 40 site na grating pairs. N'oge usoro mmepụta RDW, ndị nchọpụta jiri eriri isi ihe itoolu nke e ji aka ha mepụta ma mepụta ya. Ụdị eriri anya a nwere obere mfu na band pump pulse na mpaghara ìhè a na-ahụ anya, na-eme ka ike gbanwee nke ọma site na mgbapụta gaa na ebili mmiri gbasaara ma zere nnyonye anya nke eriri resonant dị elu na-akpata. N'okpuru ọnọdụ kacha mma, mmepụta ike mkpali mgbasa nke sistemụ ahụ nwere ike iru nanojoules 39, obosara mkpali kacha mkpụmkpụ nwere ike iru femtosekọnd 13, ike kachasị elu nwere ike ịdị elu ruo megawatt 2.2, arụmọrụ mgbanwe ike nwere ike ịdị elu ruo 13%. Ihe na-atọkwa ụtọ karị bụ na site na ịgbanwe nrụgide gas na paramita eriri, enwere ike ịgbatị sistemụ ahụ ngwa ngwa na band ultraviolet na infrared, na-enweta nhazi band sara mbara site na ultraviolet miri emi ruo infrared.
Nnyocha a abụghị naanị na ọ dị mkpa n'ọhịa bụ isi nke photonics, kamakwa ọ na-emepe ọnọdụ ọhụrụ maka ngalaba ụlọ ọrụ mmepụta ihe na ngwa. Dịka ọmụmaatụ, n'ọhịa dịka onyonyo igwe fotonịkrosọpụ multi-photon, spectroscopy oge-ngwa ngwa, nhazi ihe, ọgwụ ziri ezi, na nyocha anya na-abụghị nke linear, ụdị isi iyi ọkụ dị obere, nke dị ọnụ ala, na nke dị ọnụ ala ga-enye ndị ọrụ ngwaọrụ na mgbanwe a na-ahụtụbeghị mbụ. Karịsịa n'ọnọdụ ndị chọrọ ọnụego ugboro ugboro dị elu, ike kachasị elu na mkpali dị mkpụmkpụ, teknụzụ a enweghị mgbagha na ọ na-asọmpi karịa ma nwee ike nkwalite ka ukwuu ma e jiri ya tụnyere sistemụ mgbakwunye titanium-sapphire ma ọ bụ optical.
N'ọdịnihu, ndị otu nyocha ahụ na-eme atụmatụ imeziwanye sistemụ ahụ, dịka ijikọta usoro nhazi ugbu a nke nwere ọtụtụ ihe anya oghere n'ime eriri anya, ma ọ bụ ọbụna iji otu oscillator Mamyshev dochie njikọta oscillator na amplifier dị ugbu a, iji nweta obere na njikọta nke sistemụ ahụ. Na mgbakwunye, site na imeghari na ụdị eriri mgbochi resonance dị iche iche, iwebata gas na-arụ ọrụ Raman na modulu ugboro ugboro abụọ, a na-atụ anya na a ga-agbasa sistemụ a gaa na band sara mbara, na-enye ngwọta laser niile-fiber, wideband, ultrafast maka ọtụtụ ubi dịka ultraviolet, ìhè a na-ahụ anya na infrared.
Foto 1. Ihe osise eserese nke nhazi nke laser pulsed
Oge ozi: Mee-28-2025