Cov kws tshawb fawb ntawm Laval University hauv Canada tau tsim thawj zaugfiber ntau laseruas muaj peev xwm tsim femtosecond pulses nyob rau hauv qhov pom ntau yam ntawm cov electromagnetic spectrum, ib tug laser uas tsim ultrashort, kaj pom-wavelength pulses rau ntau yam ntawm biomedical thiab cov ntaub ntawv ua daim ntaub ntawv.
Thaum cov khoom siv ib txwm muaj rau kev tsim cov pulses pom femtosecond yog qhov nyuaj thiab tsis muaj txiaj ntsig, fiber ntau lasers muab kev cog lus zoo nrog rau qhov zoo ntawm kev ruaj ntseg, kev ntseeg siab, me me hneev taw, kev ua haujlwm siab, tsis tshua muaj nqi, thiab siab ci. Tab sis txog tam sim no, xws li lasers tsis tuaj yeem ncaj qha tsim cov teeb pom kev zoo nrog lub sijhawm nyob hauv femtosecond (10-15 vib nas this) ntau.
Tus thawj coj ntawm pab pawg tshawb fawb Réal Vallée tau hais tias lawv tau tsim qhovthawj femtosecond fiber ntau laseruas tuaj yeem ua haujlwm hauv qhov pom tau. Lub laser, raws li ib tug lanthanide-doped fluoride fiber uas emits liab lub teeb ntawm 635 nanometers, ua tiav compressed pulses nrog lub sij hawm ntawm 168 femtoseconds, lub ncov hwj chim ntawm 0.73 kilowatts, thiab ib tug repetition zaus ntawm 137 megahertz. Ntxiv mus, lawv siv lub lag luam xiav laser diode ua lub zog hauv lub cuab yeej, ua rau tag nrho cov qauv tsim muaj zog, compact, thiab siv tau zoo.
Pab neeg no sau tseg tias yog tias muaj zog dua thiab lub zog muaj nyob rau yav tom ntej, nws tuaj yeem siv dav hauv ntau daim ntawv thov. Cov ntawv thov muaj peev xwm suav nrog kev ua haujlwm siab, cov ntaub so ntswg zoo ablation, thiab ob-photon excitation microscopy. Tsis tas li ntawd, femtosecond laser pulses kuj tuaj yeem siv rau cov khoom txias-ablate thaum ua, uas yog huv dua li siv cov pulses ntev dua thaum txiav, vim tias tsis muaj thermal nyhuv los ntawm cov txheej txheem no.
Tom ntej no, cov kws tshawb fawb tau npaj los txhim kho cov thev naus laus zis los ntawm kev ua cov cuab yeej ua tiav monolithic, uas txhais tau hais tias cov khoom siv fiber ntau optic yuav raug cuam tshuam ncaj qha, uas yuav txo qis qhov poob ntawm cov cuab yeej, nce kev ua tau zoo, thiab txhim kho kev ntseeg siab, compactness, thiab. robustness ntawm laser. Lawv kuj tseem tab tom tshawb nrhiav ntau txoj hauv kev los ua kom lub zog laser pulse, lub sijhawm mem tes, thiab lub zog nruab nrab.
