Ultra-mkulu kubwereza mlingo pulsed laser

Ultra-mkulu kubwereza mlingo pulsed laser

M'dziko losawoneka bwino la kulumikizana pakati pa kuwala ndi zinthu, ma ultra-high repetition rate pulses (UHRPs) amakhala ngati olamulira nthawi yake - amazungulira nthawi yopitilira biliyoni pa sekondi iliyonse (1GHz), akugwira zala zam'ma cell a khansa m'malingaliro owoneka bwino, kunyamula zochulukira zama data mu optical fiber kulumikizana molumikizana ndi matelefoni owuluka. Makamaka pakudumpha kwa kuzindikira kwa lidar, terahertz ultra-high repetition rate pulsed lasers (100-300 GHz) akukhala zida zamphamvu zolowera pagawo losokoneza, kukonzanso malire amalingaliro atatu-atatu ndi mphamvu yosokoneza ya spatiotemporal pamlingo wa photon. Pakali pano, kugwiritsa ntchito microstructures yokumba, monga micro-ring cavities kuti amafuna nanoscale processing molondola kuti apange anayi yoweyula kusanganikirana (FWM), ndi imodzi mwa njira zazikulu kupeza kopitilira muyeso-mkulu kubwereza mlingo kuwala pulses. Asayansi akuyang'ana kwambiri kuthetsa mavuto a uinjiniya pakukonza zida zabwino kwambiri, vuto lakusintha pafupipafupi pakuyambitsa kugunda kwa mtima, komanso vuto la kutembenuka mtima pambuyo popanga ma pulse. Njira ina ndiyo kugwiritsa ntchito ulusi wosagwirizana kwambiri ndikugwiritsa ntchito kusakhazikika kwa kusinthasintha kapena mphamvu ya FWM mkati mwa laser cavity kuti musangalatse ma UHRP. Mpaka pano, tikufunikabe "nthawi yojambula nthawi".

Njira yopangira UHRP pobaya ma pulses othamanga kwambiri kuti musangalatse kutulutsa kwa FWM kumatchedwa "kuwotcha mwachangu". Zosiyana ndi zomwe tazitchula pamwambapa zopanga ma microring cavity scheme zomwe zimafuna kupopa mosalekeza, kusintha kolondola kwa detuning kuwongolera kugunda kwa mtima, komanso kugwiritsa ntchito media osalumikizana kwambiri kuti muchepetse malire a FWM, "kuwotcha" uku kumadalira mawonekedwe amphamvu kwambiri amphamvu kwambiri kuti asangalatse mwachindunji FWMtion, ndipo pambuyo pa "Kudziletsa".

Chithunzi 1 chikuwonetsa njira yayikulu yokwaniritsira kudzipanga nokha kutengera kusangalatsa kwamphamvu kwambiri kwa mbewu za dissipative fiber ring cavities. The kunja jekeseni ultrashort mbewu pulse (nthawi T0, kubwereza pafupipafupi F) amagwira ntchito ngati "gwero loyatsira" kuti akondweretse gawo lamphamvu kwambiri lamphamvu mkati mwa chitsekerero cha dissipation. The intracellular gain module imagwira ntchito mogwirizana ndi spectral shaper kuti isinthe mphamvu ya mbewu kukhala mawonekedwe owoneka ngati chisa kudzera m'magawo olumikizana mu domain-frequency domain. Izi zimadutsa malire a kupopera kosalekeza kosalekeza: kugunda kwa mbeu kumatseka pamene ikufika pamtunda wa FWM, ndipo chigawo cha dissipation chimasunga chikhalidwe chodzikonzekera cha kugunda kupyolera mu mphamvu ya kupindula ndi kutayika, ndi kubwerezabwereza kwa pulse kukhala Fs (zogwirizana ndi nthawi yapakati ndi nthawi ya FF).

Kafukufukuyu adachitanso zotsimikizira zamalingaliro. Kutengera magawo omwe adatengedwa pakuyesa koyeserera komanso ndi 1psultrafast pulse lasermonga gawo loyamba, kuyerekezera manambala kunachitika pakusintha kwanthawi ya kugunda kwa nthawi komanso ma frequency mkati mwa laser patsekeke. Zinapezeka kuti kugunda kudadutsa magawo atatu: kugawanika kwa pulse, kugunda kwanthawi ndi nthawi, komanso kugawa kwamtundu wamtundu wamtundu wamtundu wonse wa laser. Chotsatira cha manambalachi chimatsimikiziranso bwino za kudzikonza nokha kwapulse laser.

Ndi kuyambitsa zinayi yoweyula kusanganikirana zotsatira mkati dissipative CHIKWANGWANI mphete patsekeke kudzera ultrafast mbewu zimachitika poyatsira, kudzikonza m'badwo ndi kukonza sub-THZ kopitilira muyeso kubwerezabwereza pafupipafupi pulses ( khola linanena bungwe la 0.5W mphamvu pambuyo mbewu kuzimitsa) anali bwinobwino akwaniritsa, kupereka mtundu watsopano wa kuwala kumunda Z gwero akhoza kumapangitsanso sub-THZ gwero la kuwala kumunda: kusintha kwa mtambo mpaka mulingo wa millimeter. Kudziletsa kwa pulse kumachepetsa kwambiri kugwiritsa ntchito mphamvu zamagetsi. Mapangidwe amtundu uliwonse amaonetsetsa kuti magwiridwe antchito azikhala okhazikika mu gulu lachitetezo cha 1.5 μm. Kuyang'ana zam'tsogolo, teknolojiyi ikuyembekezeka kuyendetsa chisinthiko cha lidar yokwera galimoto kupita ku miniaturization (yochokera ku MZI micro-filters) ndi kuzindikira kwautali (kuwonjezeka kwa mphamvu ku> 1W), ndikusinthanso kuti zigwirizane ndi zofunikira za malingaliro a malo ovuta kupyolera mu kuyatsa kogwirizana kwamitundu yambiri ndi kulamulira mwanzeru.