Sub-20 femtosecond chiedza chinooneka chinogona kugadziriswa ne pulsed laser source

Chiedza chinooneka cheSub-20 femtosecondsosi yelaser inogadziriswa

Munguva pfupi yapfuura, chikwata chevaongorori kubva kuUK chakaburitsa ongororo itsva, ichizivisa kuti vakabudirira kugadzira chiedza chinooneka che megawatt-level sub-20 femtosecond chinogona kugadziriswa.pulsed laser sosiIyi sosi yelaser ine pulsed, inokurumidza zvikurulaser yefaibhaSisitimu iyi inokwanisa kugadzira ma pulses ane ma wavelength anogadziriswa, nguva pfupi kwazvo, simba rinosvika 39 nanojoules, uye simba repamusoro rinodarika 2 megawatts, zvichivhura mikana mitsva yekushandisa minda yakaita se ultrafast spectroscopy, biological imaging, uye industrial processing.

Chinhu chikuru chehunyanzvi uhwu chiri mukubatanidzwa kwenzira mbiri dzemazuva ano: "Gain-Managed nonlinear Amplification (GMNA)" uye "Resonant Dispersive Wave (RDW) emission". Kare, kuti pave nemapulse e-ultrashshort anogadziriswa zvakanaka, ma lasers e-titanium-sapphire anodhura uye akaomarara aiwanzodiwa. Midziyo iyi yaisangova inodhura chete, yakakura, uye yakaoma kuchengetedza, asiwo yakaganhurirwa nemaitiro ekudzokorora akaderera uye nzvimbo dzekugadzirisa. Mhinduro ye-fiber yakagadzirwa panguva ino haina kungorerutsa zvakanyanya maumbirwo ehurongwa asiwo inoderedza zvakanyanya mitengo nekuomarara. Inogonesa kugadzirwa zvakananga kwe-sub-20 femtosecond, inogona kugadziriswa kusvika 400 kusvika 700 nanometers uye kupfuura mapulse ane simba guru pa frequency yakakwira yekudzokorora ye4.8 MHz. Chikwata chekutsvagisa chakawana budiriro iyi kuburikidza nehurongwa hwakagadzirwa nemazvo. Kutanga, vakashandisa oscillator inochengetedza mode-locked ytterbium fiber oscillator yakavakirwa pa nonlinear amplification ring mirror (NALM) senzvimbo yembeu. Dhizaini iyi haingovimbisi chete kugadzikana kwenguva refu kwehurongwa, asiwo inodzivirira dambudziko rekuora kwezvinwiwa zvinonyudzwa mumuviri. Mushure mekutanga kusimba uye kudzvanywa kwepulse, mapulse embeu anoiswa muchikamu cheGMNA. GMNA inoshandisa self-phase modulation uye longitudinal asymmetric gain distribution mu optical fibers kuti iwane spectral broadening uye igadzire mapulse mapfupi ane almost perfect linear chirp, ayo anozopedzisira amanikidzwa kusvika pasi pe40 femtoseconds kuburikidza ne grating pairs. Munguva yeRDW generation stage, vaongorori vakashandisa ma fibers e nine-resonator anti-resonance hollow-core akagadzirwa nega. Rudzi urwu rwe fiber ye optical haruna kurasikirwa kwakanyanya mu pump pulse band uye visible light region, zvichiita kuti simba rikwanise kushandurwa zvinobudirira kubva pa pump kuenda ku dispersed wave uye kudzivirira kukanganiswa kunokonzerwa ne high-loss resonant band. Mumamiriro ezvinhu akanaka, simba remhepo rinobuda nehurongwa rinogona kusvika ma nanojoules makumi matatu nemapfumbamwe, upamhi hwemhepo hupfupi hunogona kusvika ma femtosecond gumi nematatu, simba repamusoro rinogona kusvika ma megawatts maviri nemaviri, uye simba rekushandura simba rinogona kusvika pa13%. Chinonyanya kufadza ndechekuti nekugadzirisa kumanikidzwa kwegasi uye ma fiber parameters, hurongwa hunogona kuwedzerwa nyore nyore kune ma ultraviolet ne infrared bands, zvichiita kuti pave ne wideband tuning kubva ku deep ultraviolet kuenda ku infrared.

Tsvagiridzo iyi haina kukosha chete mumunda we photonics, asi inovhurawo mamiriro matsva emuminda yemaindasitiri nekushandiswa. Semuenzaniso, muminda yakaita se multi-photon microscopy imaging, ultrafast time-resolved spectroscopy, material processing, precision medicine, uye ultrafast nonlinear optics research, iyi mhando itsva ye ultrafast light source compact, inoshanda, uye isingadhuri ichapa vashandisi zvishandiso zvisina kumboitika uye kushanduka. Kunyanya muzviitiko zvinoda kudzokorora kwakanyanya, simba repamusoro uye ultra-short pulses, tekinoroji iyi pasina mubvunzo ine makwikwi akawanda uye ine mukana mukuru wekusimudzira kana tichienzanisa netitanium-sapphire yechinyakare kana optical parametric amplification systems.

Mune ramangwana, timu yekutsvagisa inoronga kuwedzera kugadzirisa sisitimu iyi, zvakaita sekubatanidza magadzirirwo aripo iye zvino ane zvikamu zvakawanda zve optical zve free-space mu optical fibers, kana kutoshandisa imwe chete Mamyshev oscillator kutsiva musanganiswa we oscillator ne amplifier, kuitira kuti sisitimu iyi ive miniaturization uye inobatanidzwa. Pamusoro pezvo, nekuchinja kune marudzi akasiyana e anti-resonance fibers, kuunza magasi anoshanda eRaman uye frequency doubling modules, sisitimu iyi inotarisirwa kuwedzerwa kuita bhendi rakakura, ichipa mhinduro dze all-fiber, wideband, ultrafast laser kune akawanda ma fields akadai se ultraviolet, visible light uye infrared.

Mufananidzo 1. Dhiyagiramu yehurongwa hwekugadzirisa laser yakapwanyika