Faib pulse (divided pulse) ua ke nrog optical amplification tau tsim kev faib pulse amplification (DPA) technology. Nyob rau hauv xyoo tas los no, ntau pab pawg tau siv kev faib cov mem tes rau ntau yam uas tsis yog-linear pulse compression schemes thiab tsim cov kev faib pulse nonlinear compression cov tswv yim los txhim kho lub zog pulse.
Thawj qhov ua haujlwm tau nthuav tawm hauv qhov teeb meem no ua ke sib cais-mem tes nrog ntau qhov kab noj hniav compression thawj zaug. Multipass kab noj hniav compression muaj ntau yam zoo, xws li ntau dua transmittance thiab muaj peev xwm ntawm kev nyab xeeb thiab txhim khu kev qha nonlinear compression ntawm kilowatt thiab millijoule pulses, txawm li cas los xij, nws tseem raug txwv los ntawm kab noj hniav kho qhov muag kev puas tsuaj thiab roj ionization. Txhawm rau kov yeej cov kev txwv no, pawg Jena Limpert hauv tebchaws Yelemes tau siv cov txheej txheem sib cais-miv hauv kev sim ntau qhov kab noj hniav compression. Lub hauv ntej kawg yog 16-txoj kev chirped pulse amplification (CPA)-raws li fiber ntau laser nrog ib tug synthesized beam txoj kab uas hla ntawm 8 hli thiab ob-theem CPA compression, uas muaj peev xwm output ib laser nrog ib tug nruab nrab lub zog ntawm 200 W, mem tes lub zog ntawm 4 mJ, thiab mem tes dav ntawm 175 fs. Lub laser tso zis tau muab faib ua plaub pulses los ntawm ob lub BBO crystals thiab ces nkag mus rau hauv multi-pass kab noj hniav kom broaden lub spectrum, tom qab uas cov mem tes synthesis twb paub los ntawm cov BBO muaju, thiab thaum kawg cov synthesized pulses yog compressed siv ntau chirped tsom iav.
Lub beam dhau los ntawm cov kab noj hniav multipass 26 zaug nrog 350 mbar argon gas, thiab tag nrho cov zis efficiency yog 84 feem pua nrog rau qhov kawg tso zis zog ntawm 169 W. Lub spectrum ua ntej thiab tom qab compression yog hais txog 120 nm ntawm 20 dB bandwidth ntawm compressed spectrum. . Thaum lub pulse mus txog qhov kev hloov pauv ntawm lub plawv tsis pub dhau 32 fs, cov pulse me me tsis pom zoo tuaj yeem pom ntawm 800 fs, thiab tsis muaj pulses me me ntawm txhua qhov tuaj yeem pom ntawm 1600 fs, qhia txog lub sijhawm pulse zoo heev ntawm qhov sib piv thiab kev sib txuas.
Qhov thib ob ua hauj lwm nthuav tawm nyob rau hauv qhov teeb meem no ua ke sib cais-mem tes thiab hollow-core fiber compression rau compress high-zog pulses. Txhawm rau kom tsis txhob muaj kev cuam tshuam rau tus kheej thiab cov roj ionization los ntawm compressing pulses nrog inert gas-filled hollow-core fibers, cov kev xaiv suav nrog kev hloov cov mem tes polarization xeev mus rau lub voj voog polarization, qhia cov roj siab gradient, thiab siv cov kev txiav txim siab dua ntawm cov hollow- core fiber, tab sis cov qauv no tseem tsis tuaj yeem nce lub zog pulse compressible siab tshaj qhov pib ntawm cov roj ionization. Lawv siv calcite, ib nrab-yoj daim hlau thiab polarizers rau pulse pulse thiab synthesize pulses, siv ib tug hollow-core fiber uas muaj Xe gas li lub spectral broadning nruab nrab, thiab ces siv ib tug chirped daim iav los compress cov synthesized ib leeg mem tes.
Cov kev sim broadened spectrum muaj ib tug raug parabolic qauv broadened los ntawm tus kheej-phase modulation nyhuv, qhov twg modulation stripe spacing yog 0.5 nm, txuam lub 7.2 ps qeeb qhia los ntawm calcite. Thaum kawg, daim iav chirped yog siv los qhia txog kev tawg ntawm -18000 fs2, compressing lub mem tes mus rau 89 fs nrog lub ncov lub zog ntawm 91 feem pua ntawm lub ncov lub zog ntawm kev hloov pauv-tsim mem tes, uas muaj lub zog ntawm 5. 0 mJ.
Thawj qhov kev vam meej ntawm kev sib cais-pulsing mus rau multipass kab noj hniav uas tsis yog-linear mem tes compression tswv yim siv plaub pulses rau spectral broadning nce tag nrho cov zis mem tes zog ntawm cov uas twb muaj lawm multipass kab noj hniav compression rau 3.4 mJ nrog ib tug nruab nrab lub zog ntawm 169 WGW Jenkins li al. siv split-pulsing kom kov yeej ionization txwv nyob rau hauv hollow-core fiber compression, thiab rau ib tug mem tes, ionization txwv cov zis mem tes zog rau 2.7 mJ. Los ntawm kev faib cov mem tes ua plaub lub zog qis, cov pab pawg tau txais cov mem tes compressed ntawm 5.0 mJ.
