Laser ye pulsed yakakora zvakanyanya

Laser ye pulsed yakakora zvakanyanya

Munyika ine microscopic yekudyidzana pakati pechiedza nezvinhu, ma ultra-high repetition rate pulses (UHRPs) anoshanda sevatongi chaivo venguva - anotenderera kanopfuura bhiriyoni pasekondi (1GHz), achitora ma molecular fingerprints emasero ekenza mu spectral imaging, achitakura huwandu hwakawanda hwedata mu optical fiber communication, uye achienzanisa wavelength coordinates yenyeredzi mumatelescopes. Kunyanya mukusvetuka kwe dimension ye detection ye lidar, terahertz ultra-high repetition rate pulsed lasers (100-300 GHz) ari kuva maturusi ane simba ekupinda mu interference layer, achigadzirisa patsva miganhu ye three-dimensional perception nesimba re spatiotemporal manipulation pa level ye photon. Parizvino, kushandisa artificial microstructures, senge micro-ring cavities dzinoda nanoscale processing accuracy kuti dzigadzire four-wave mixing (FWM), ndeimwe yenzira huru dzekuwana ultra-high repetition rate optical pulses. Masayendisiti ari kutarisa pakugadzirisa matambudziko einjiniya mukugadzirisa ultra-fine structures, dambudziko re frequency tuning panguva yekutanga pulse, uye dambudziko re conversion efficiency mushure me pulse generation. Imwe nzira ndeyekushandisa fibers dzisina kurongeka zvakanyanya uye kushandisa modulation instability effect kana FWM effect mukati me laser cavity kuti tifadze UHRPs. Kusvika pari zvino, tichiri kuda "time shaper" ine hunyanzvi.

Maitiro ekugadzira UHRP nekuisa ma pulses e-ultrafast kuti awedzere simba reFWM rinopararira anotsanangurwa se "ultrafast ignition". Kusiyana nechirongwa che microring cavity chataurwa pamusoro apa chinoda kupomba nguva dzose, kugadzirisa kwakanyatsojeka kwe detuning kuti idzore pulse, uye kushandisa nzira dzisina kujeka kuderedza FWM threshold, "ignition" iyi inoenderana nehunhu hwesimba repamusoro rema pulses e-ultrafast kuti iwedzere FWM zvakananga, uye mushure me "ignition off", inowana UHRP inozvitsigira.

Mufananidzo 1 unoratidza nzira huru yekuwana kurongeka kwepulse zvichibva pakukurumidza kwekukurumidza kwembeu yemhasuru dzinoparadzira fiber ring cavities. Mhepo yemhasuru pfupi inopinzwa kunze (nguva T0, frequency F) inoshanda se "inopisa" yekumutsa munda wemhasuru une simba guru mukati megomba rekuparadzira. Module yekuwedzera kwemasero inoshanda pamwe chete ne spectral shaper kushandura simba remhasuru kuita mhinduro ye spectral yakaita sekamu kuburikidza nekutonga kwemajoini munzvimbo ye frequency yenguva. Maitiro aya anoputsa miganhu yekupomba kunoramba kuripo kwechinyakare: mhepo yemhasuru inodzima kana yasvika pamuganhu we FWM wekuparadzira, uye gomba rekuparadzira rinochengetedza mamiriro ekuronga kwemhasuru kuburikidza ne dynamic balance ye gain and loss, ne frequency yekudzokorora kwemhasuru iri Fs (inoenderana ne frequency FF uye period T yegomba).

Chidzidzo ichi chakaitawo ongororo yedzidziso. Zvichibva pamatanho akagamuchirwa mukuyedza uye ne1pslaser yekurova kwemoyo inokurumidzasenzvimbo yekutanga, kutevedzera nhamba kwakaitwa pakushanduka kwenzvimbo yenguva yepulse uye frequency mukati melaser cavity. Zvakaonekwa kuti pulse yakapfuura nematanho matatu: kupatsanurana kwepulse, kutenderera kwepulse periodic, uye kugoverwa kwepulse kwakafanana mukati melaser cavity yese. Mhedzisiro iyi yenhamba inoratidzawo zvizere hunhu hwekuzvironga hwelaser yekurova kwemoyo.

Nekukonzera kusanganiswa kwemafungu mana mukati megomba re fiber rinopararira kuburikidza nekupisa kwembeu nekukurumidza, kugadzirwa kwekuzvironga uye kuchengetedza mapuru e sub-THZ ultra-high repetition frequency pulses (kubuda kwakagadzikana kwesimba re 0.5W mushure mekudzima kwembeu) kwakabudirira, zvichipa mhando itsva yechiedza chemunda we lidar: Kudzokorora kwayo kwe sub-THZ level kunogona kuwedzera resolution ye point cloud kusvika pa millimeter level. Chinhu chinozvitsigira che pulse chinoderedza zvakanyanya kushandiswa kwesimba resisisitimu. Chimiro che all-fiber chinovimbisa kushanda kwakasimba mu 1.5 μm eye safety band. Tichitarisa kune ramangwana, tekinoroji iyi inotarisirwa kutungamira kushanduka kwe lidar yakaiswa mumota kuenda kune miniaturization (zvichibva pa MZI micro-filters) uye kuona kure kure (kuwedzera simba kusvika > 1W), uye kuwedzera kuchinjira kuzvinodiwa zvekunzwisisa nharaunda dzakaoma kuburikidza nekupisa kwakabatana kwemafungu akawanda uye kutonga kwakangwara.