Ukukhanya okubonakalayo kwe-Sub-20 femtosecondumthombo we-laser oshukunyiswayo onokuguqulwa
Kutshanje, iqela lophando elivela e-UK lipapashe uphando olutsha, libhengeza ukuba liphumelele ekuphuhliseni isibane esibonakalayo esingaphantsi kwama-20 femtosecond esikwaziyo ukulungiswa.umthombo we-laser oshukumayoLo mthombo we-laser oshukumayo, okhawulezayo kakhului-laser yefayibhaInkqubo iyakwazi ukuvelisa iipulses ezinee-wavelengths ezihlengahlengiswayo, ubude obufutshane kakhulu, amandla aphezulu njengee-nanojoules ezingama-39, kunye namandla aphezulu adlula ii-megawatts ezi-2, ivula amathuba amatsha okusetyenziswa kweendawo ezifana ne-ultrafast spectroscopy, i-biological imaging, kunye ne-industrial processing.
Eyona nto iphambili kule teknoloji ikukudibanisa iindlela ezimbini eziphambili: "i-Gain-Managed nonlinear Amplification (GMNA)" kunye ne-"Resonant Dispersive Wave (RDW) emission". Ngaphambili, ukuze kufunyanwe ii-ultrashshort pulses ezisebenza kakuhle nezinokuguqulwa okuphezulu, ii-laser ze-titanium-sapphire ezibizayo nezintsonkothileyo okanye ii-optical parametric amplifiers zazidla ngokufuneka. Ezi zixhobo zazingabizi nje kuphela, zinkulu, kwaye kunzima ukuzigcina, kodwa zazikwanqunyelwe ngamazinga aphantsi okuphindaphinda kunye nobubanzi bokulungisa. Isisombululo se-all-fiber esakhiwe ngeli xesha asizange senze nje kuphela uyilo lwenkqubo lube lula kodwa sinciphisa kakhulu iindleko kunye nobunzima. Sivumela ukuveliswa ngokuthe ngqo kwe-sub-20 femtosecond, enokulungiswa ukuya kwi-400 ukuya kwi-700 nanometers kwaye ngaphaya kwe-high-power pulses kwi-frequency ephezulu yokuphindaphinda ye-4.8 MHz. Iqela lophando liphumelele olu phumelelo ngoyilo lwenkqubo oluyilwe ngokuchanekileyo. Okokuqala, basebenzise i-oscillator ye-ytterbium fiber egcina i-polarization ngokupheleleyo esekelwe kwi-nonlinear amplification ring mirror (NALM) njengomthombo wembewu. Olu yilo aluqinisekisi nje kuphela ukuzinza kwexesha elide kwenkqubo, kodwa lukwathintela ingxaki yokuwohloka kwee-absorbers ezigcweleyo zomzimba. Emva kokukhulisa kwangaphambili kunye nokucinezelwa kwe-pulse, ii-pulses zembewu zifakwa kwisigaba se-GMNA. I-GMNA isebenzisa i-self-phase modulation kunye nokusasazwa kwe-longitudinal asymmetric gain kwii-optical fibers ukufezekisa ukwanda kwe-spectral kunye nokuvelisa ii-pulses ezimfutshane kakhulu ezine-linear chirp egqibeleleyo, ekugqibeleni ezicinezelwa kwi-sub-40 femtoseconds ngokusebenzisa ii-grating pairs. Ngexesha lesigaba sokuveliswa kwe-RDW, abaphandi basebenzise ii-fibers ze-anti-resonance hollow-core eziziyilileyo kwaye zenze ii-nine-resonator anti-resonance hollow-core fibers. Olu hlobo lwe-optical fiber lunelahleko ephantsi kakhulu kwi-pump pulse band nakwindawo yokukhanya ebonakalayo, okuvumela amandla ukuba aguqulwe ngokufanelekileyo ukusuka kwi-pump ukuya kwi-dispersed wave kwaye kuthintelwe ukuphazamiseka okubangelwa yi-high-loss resonant band. Phantsi kweemeko ezifanelekileyo, amandla okukhupha i-dispersion wave pulse yinkqubo anokufikelela kwi-nanojoules ezingama-39, ububanzi be-pulse obufutshane bunokufikelela kwi-13 femtoseconds, amandla aphezulu anokufikelela kwi-2.2 megawatts, kwaye ukusebenza kakuhle kokuguqulwa kwamandla kunokufikelela kwi-13%. Okuvuyisayo ngakumbi kukuba ngokulungelelanisa uxinzelelo lwegesi kunye neeparameter zefayibha, inkqubo inokwandiswa ngokulula kwiibhendi ze-ultraviolet kunye ne-infrared, ifezekise ukulungiswa kwe-wideband ukusuka kwi-ultraviolet enzulu ukuya kwi-infrared.
Olu phando alubalulekanga kangako kwicandelo elisisiseko le-photonics, kodwa lukwavula imeko entsha kwiinkalo zoshishino nezokusetyenziswa. Umzekelo, kwiinkalo ezifana ne-multi-photon microscopy imaging, i-ultrafast time-resolved spectroscopy, ukucutshungulwa kwezinto, unyango oluchanekileyo, kunye nophando lwe-ultrafast nonlinear optics, olu hlobo lutsha oluncinci, olusebenzayo, nolungabizi kakhulu lomthombo wokukhanya we-ultrafast luya kubonelela abasebenzisi ngezixhobo ezingazange zibonwe ngaphambili kunye nokuguquguquka. Ingakumbi kwiimeko ezifuna amazinga aphezulu okuphindaphinda, amandla aphezulu kunye nee-pulses ezimfutshane kakhulu, obu buchwephesha ngokungathandabuzekiyo bukhuphisana ngakumbi kwaye bunamandla amakhulu okunyusa xa kuthelekiswa neenkqubo ze-titanium-sapphire zendabuko okanye ze-optical parametric amplification.
Kwixesha elizayo, iqela lophando liceba ukuphucula ngakumbi inkqubo, njengokudibanisa uyilo lwangoku oluqulethe izinto ezininzi ze-free-space optical kwiifayibha ze-optical, okanye nokusebenzisa i-oscillator enye yeMamyshev ukuze ithathe indawo ye-oscillator yangoku kunye ne-amplifier indibaniselwano, ukuze kufezekiswe i-miniaturization kunye nokuhlanganiswa kwenkqubo. Ukongeza, ngokuziqhelanisa neentlobo ezahlukeneyo zeefayibha ezichasene ne-resonance, ukwazisa iigesi ezisebenzayo zeRaman kunye neemodyuli eziphindaphindayo ze-frequency, le nkqubo kulindeleke ukuba yandiswe ibe yibhendi ebanzi, ibonelela ngezisombululo ze-all-fiber, i-wideband, i-ultrafast laser kwiindawo ezininzi ezifana ne-ultraviolet, ukukhanya okubonakalayo kunye ne-infrared.
Umfanekiso 1. Umzobo wesicwangciso sokulungiswa kwe-pulsed laser
Ixesha leposi: Meyi-28-2025