Lub teeb pom kev zoo uas tsis pub dhau 20 femtosecondqhov chaw laser pulsed tunable
Tsis ntev los no, ib pab neeg tshawb fawb los ntawm UK tau tshaj tawm ib txoj kev tshawb fawb tshiab, tshaj tawm tias lawv tau tsim lub teeb pom kev zoo uas muaj zog megawatt-level sub-20 femtosecond uas tuaj yeem hloov kho tau.pulsed laser qhov chawQhov chaw laser pulsed no, ceev heevlaser fiberLub kaw lus muaj peev xwm tsim cov pulses nrog cov wavelengths tunable, ultra-short durations, lub zog siab txog li 39 nanojoules, thiab lub zog siab tshaj 2 megawatts, qhib cov kev thov tshiab rau cov teb xws li ultrafast spectroscopy, biological imaging, thiab kev ua lag luam.
Lub ntsiab lus tseem ceeb ntawm cov thev naus laus zis no yog kev sib xyaw ua ke ntawm ob txoj kev tshiab: "Gain-Managed nonlinear Amplification (GMNA)" thiab "Resonant Dispersive Wave (RDW) emission". Yav dhau los, kom tau txais cov pulses ultrashort tunable zoo li no, feem ntau xav tau cov titanium-sapphire lasers kim thiab nyuaj lossis optical parametric amplifiers. Cov khoom siv no tsis yog tsuas yog kim, loj, thiab nyuaj rau kev tswj hwm, tab sis kuj txwv los ntawm cov nqi rov ua dua qis thiab cov qib tuning. Cov kev daws teeb meem tag nrho-fiber tsim lub sijhawm no tsis yog tsuas yog ua kom yooj yim rau lub cev qauv xwb tab sis kuj txo cov nqi thiab qhov nyuaj. Nws ua rau muaj kev tsim cov sub-20 femtosecond ncaj qha, tunable rau 400 txog 700 nanometers thiab dhau ntawm cov pulses muaj zog siab ntawm qhov zaus rov ua dua siab ntawm 4.8 MHz. Pab pawg tshawb fawb tau ua tiav qhov kev tawg no los ntawm kev tsim qauv system tsim tshwj xeeb. Ua ntej, lawv siv lub polarization-preserving mode-locked ytterbium fiber oscillator raws li nonlinear amplification ring mirror (NALM) ua qhov chaw noob. Qhov kev tsim no tsis yog tsuas yog ua kom muaj kev ruaj khov mus sij hawm ntev ntawm lub cev xwb, tab sis kuj zam qhov teeb meem kev puas tsuaj ntawm cov khoom nqus dej uas muaj zog. Tom qab kev ua kom lub zog ua ntej thiab kev nias lub zog, cov noob pulses raug qhia rau hauv theem GMNA. GMNA siv kev hloov kho tus kheej thiab kev faib tawm asymmetric longitudinal hauv cov fibers optical kom ua tiav qhov dav dav spectral thiab tsim cov pulses ultrashort nrog ze li ntawm linear chirp zoo meej, uas thaum kawg raug nias rau hauv qab-40 femtoseconds los ntawm cov khub grating. Thaum lub sijhawm RDW tiam, cov kws tshawb fawb tau siv tus kheej tsim thiab tsim cuaj-resonator anti-resonance hollow-core fibers. Hom fiber optical no muaj qhov poob qis heev hauv lub twj tso kua mis pulse band thiab thaj chaw pom kev, ua rau lub zog hloov pauv tau zoo los ntawm lub twj tso kua mis mus rau nthwv dej dispersed thiab zam kev cuam tshuam los ntawm cov resonant band poob siab. Nyob rau hauv qhov zoo tshaj plaws, lub zog tso zis ntawm lub zog dispersion wave pulse los ntawm lub kaw lus tuaj yeem ncav cuag 39 nanojoules, qhov dav luv tshaj plaws tuaj yeem ncav cuag 13 femtoseconds, lub zog siab tshaj plaws tuaj yeem siab txog 2.2 megawatts, thiab kev hloov pauv hluav taws xob tuaj yeem siab txog 13%. Qhov zoo siab dua yog tias los ntawm kev kho qhov siab ntawm roj thiab cov yam ntxwv fiber, lub kaw lus tuaj yeem txuas ntxiv mus rau ultraviolet thiab infrared bands, ua tiav kev hloov kho dav dav los ntawm ultraviolet tob mus rau infrared.
Cov kev tshawb fawb no tsis yog tsuas yog muaj qhov tseem ceeb hauv thaj chaw tseem ceeb ntawm photonics xwb, tab sis kuj qhib qhov xwm txheej tshiab rau kev lag luam thiab daim ntawv thov. Piv txwv li, hauv cov teb xws li ntau-photon microscopy imaging, ultrafast time-resolved spectroscopy, cov khoom siv ua, precision medicine, thiab ultrafast nonlinear optics research, qhov compact, efficiency, thiab pheej yig hom tshiab ntawm ultrafast light source no yuav muab cov neeg siv nrog cov cuab yeej tsis tau muaj dua thiab kev ywj pheej. Tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas xav tau cov nqi rov ua dua siab, lub zog siab tshaj plaws thiab ultra-luv pulses, cov thev naus laus zis no yeej muaj kev sib tw ntau dua thiab muaj peev xwm txhawb nqa ntau dua piv rau cov titanium-sapphire lossis optical parametric amplification systems.
Yav tom ntej, pab pawg tshawb fawb npaj yuav ua kom lub kaw lus zoo dua, xws li kev koom ua ke cov qauv tam sim no uas muaj ntau yam khoom siv kho qhov muag dawb rau hauv cov fibers kho qhov muag, lossis txawm tias siv ib qho Mamyshev oscillator los hloov cov oscillator tam sim no thiab amplifier ua ke, txhawm rau ua tiav qhov miniaturization thiab kev koom ua ke ntawm lub kaw lus. Tsis tas li ntawd, los ntawm kev hloov kho rau ntau hom fibers tiv thaiv resonance, qhia Raman active gases thiab frequency doubling modules, lub kaw lus no xav tias yuav nthuav dav mus rau qhov dav dua, muab cov kev daws teeb meem laser tag nrho, wideband, ultrafast rau ntau qhov chaw xws li ultraviolet, pom lub teeb thiab infrared.
Daim Duab 1. Daim duab qhia txog kev kho lub laser pulsed
Lub sijhawm tshaj tawm: Tsib Hlis-28-2025