Sub-20 femtosecond pom lub teeb tunable pulsed laser qhov chaw

Sub-20 femtosecond pom lub teebtunable pulsed laser qhov chaw

Tsis ntev los no, ib pab neeg tshawb fawb los ntawm UK tau tshaj tawm txoj kev tshawb fawb tshiab, tshaj tawm tias lawv tau ua tiav kev tsim kho lub teeb megawatt-theem sub-20 femtosecond pom lub teeb tunable.pulsed laser qhov chaw. Qhov no pulsed laser qhov chaw, ultrafastfiber ntau laserLub kaw lus muaj peev xwm tsim cov pulses nrog tunable wavelengths, lub sijhawm luv luv, lub zog siab li 39 nanojoules, thiab lub zog siab tshaj li 2 megawatts, qhib cov npe tshiab rau daim ntawv thov kev cia siab rau thaj chaw xws li ultrafast spectroscopy, biological imaging, thiab industrial processing.

Lub ntsiab tseem ceeb ntawm cov thev naus laus zis no yog nyob rau hauv kev sib xyaw ntawm ob txoj hauv kev: "Gain-Managed nonlinear Amplification (GMNA)" thiab "Resonant Dispersive Wave (RDW) emission". Yav dhau los, kom tau txais cov txiaj ntsig zoo li no tau txais txiaj ntsig ultrashshort pulses, kim thiab nyuaj titanium-sapphire lasers lossis optical parametric amplifiers feem ntau xav tau. Cov cuab yeej no tsis yog tsuas yog kim, loj, thiab nyuaj rau kev tswj hwm, tab sis kuj txwv los ntawm cov nqi qis dua thiab kev sib tw. Kev daws teeb meem tag nrho-fiber tsim lub sijhawm no tsis yog tsuas yog ua kom yooj yim rau lub system architecture tab sis kuj txo cov nqi thiab kev nyuaj. Nws tso cai rau cov tsim ncaj qha ntawm sub-20 femtosecond, tunable mus rau 400 mus rau 700 nanometers thiab tshaj lub zog pulses ntawm lub siab repetition zaus ntawm 4.8 MHz. Pab neeg tshawb fawb tau ua tiav qhov kev ua tiav no los ntawm kev tsim qauv tsim qauv zoo. Ua ntej, lawv siv tag nrho cov polarization-preserving hom-xauv ytterbium fiber oscillator raws li nonlinear amplification nplhaib iav (NALM) ua cov noob qhov chaw. Qhov kev tsim no tsis tsuas yog ua kom muaj kev ruaj ntseg ntev ntawm lub cev, tab sis kuj zam qhov teeb meem degradation ntawm lub cev saturated absorbers. Tom qab preamplification thiab mem tes compression, cov noob pulses tau nkag mus rau hauv GMNA theem. GMNA siv tus kheej-theem kev hloov pauv thiab qhov ntev asymmetric nce kev faib tawm hauv cov fibers kho qhov muag kom ua tiav spectral broadening thiab tsim cov pulses ultrashort nrog ze li zoo meej linear chirp, uas yog thaum kawg compressed rau sub-40 femtoseconds los ntawm grating khub. Thaum lub sijhawm RDW tiam, cov kws tshawb fawb siv tus kheej tsim thiab tsim cuaj-resonator los tiv thaiv resonance hollow-core fibers. Hom fiber ntau optical no muaj qhov poob qis heev hauv lub twj tso kua mis pulse band thiab pom lub teeb pom kev zoo, ua kom lub zog hloov pauv tau zoo los ntawm lub twj tso kua mis mus rau cov yoj dispersed thiab tsis txhob cuam tshuam los ntawm high-loss resonant band. Nyob rau hauv qhov kev pom zoo, lub zog dispersion pulse lub zog tso tawm los ntawm lub cev tuaj yeem ncav cuag 39 nanojoules, qhov luv tshaj pulse dav tuaj yeem ncav cuag 13 femtoseconds, lub zog siab tshaj plaws tuaj yeem siab txog 2.2 megawatts, thiab lub zog hloov pauv tuaj yeem siab txog 13%. Qhov zoo siab tshaj plaws yog tias los ntawm kev kho cov roj siab thiab cov ntsuas fiber ntau, lub kaw lus tuaj yeem txuas tau yooj yim mus rau ultraviolet thiab infrared bands, ua tiav qhov dav dav ntawm qhov sib sib zog nqus ultraviolet mus rau infrared.

Qhov kev tshawb fawb no tsis yog tsuas yog tuav qhov tseem ceeb hauv qhov tseem ceeb ntawm photonics, tab sis kuj qhib qhov xwm txheej tshiab rau kev lag luam thiab daim ntawv thov. Piv txwv li, nyob rau hauv cov teb xws li ntau-photon microscopy imaging, ultrafast time-resolved spectroscopy, cov khoom ua, precision tshuaj, thiab ultrafast nonlinear optics kev tshawb fawb, qhov no compact, npaum, thiab tsawg-nqi tshiab hom ultrafast lub teeb yuav muab cov neeg siv nrog unprecedented cov cuab yeej thiab yooj. Tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas yuav tsum tau rov ua dua tus nqi siab, lub zog siab tshaj plaws thiab luv luv pulses, cov thev naus laus zis no tsis muaj kev sib tw ntau dua thiab muaj peev xwm txhawb nqa ntau dua piv rau cov tsoos titanium-sapphire lossis optical parametric amplification systems.

Nyob rau hauv lub neej yav tom ntej, pab neeg tshawb fawb npaj yuav ua kom zoo dua rau lub system, xws li kev sib koom ua ke tam sim no architecture uas muaj ntau qhov chaw dawb qhov chaw kho qhov muag rau hauv cov khoom siv kho qhov muag, lossis txawm tias siv ib qho Mamyshev oscillator los hloov cov oscillator tam sim no thiab amplifier ua ke, thiaj li ua tiav qhov miniaturization thiab kev koom ua ke ntawm lub system. Tsis tas li ntawd, los ntawm kev hloov mus rau ntau hom kev tiv thaiv resonance fibers, qhia Raman nquag roj thiab zaus ob npaug ntawm modules, qhov system no yuav tsum tau nthuav dav mus rau qhov dav dav, muab tag nrho fiber ntau, wideband, ultrafast laser daws rau ntau qhov chaw xws li ultraviolet, pom lub teeb thiab infrared.

Daim duab 1. Schematic daim duab ntawm lub tuning ntawm lub pulsed laser