Beddel xawaaraha garaaca wadnaha eeLaysarka ultrashort oo aad u xoog badan
Laysarada ultra-gaaban guud ahaan waxay tixraacaan garaaca garaaca garaaca garaaca garaaca ee tobanaan iyo boqolaal femtose seconds, awooda ugu sarreysa ee terawatts iyo petawatts, iyo xooga iftiinkooda diirada ayaa ka badan 1018 W/cm2. Laser ultra-gaaban iyo isha shucaaca sare ee la soo saaray iyo isha walxaha tamarta sare leh ayaa leh qiime balaadhan oo codsi ah oo dhinacyo badan oo cilmi baaris aasaasi ah sida fiisigiska tamarta sare, fiisigiska qaybta, fiisigiska balasmaha, fiisigiska nukliyeerka iyo astrophysics, iyo soosaarka sayniska Natiijooyinka cilmi-baaristu waxay markaa u adeegi karaan warshadaha farsamada-sare ee khuseeya, caafimaadka caafimaadka, tamarta deegaanka iyo amniga difaaca qaranka. Tan iyo markii la abuuray tignoolajiyada kor u qaadida garaaca garaaca wadnaha ee 1985, soo ifbaxa adduunka ugu horreeyay ee garaaca wattleysarka1996 iyo dhamaystirka 10-ka garaaca watt laser-ka ugu horreeya adduunka ee 2017, diiradda laser ultra-gaaban ee la soo dhaafay ayaa inta badan ahaa in la gaaro "iftiinka ugu daran". Sanadihii la soo dhaafay, cilmi-baaristu waxay muujisay in marka la eego xaaladda ilaalinta garaaca wadnaha super laser, haddii xawaaraha gudbinta garaaca wadnaha ee laser ultra-gaaban la xakameyn karo, waxay keeni kartaa laba jeer natiijada iyadoo kala badh dadaalka codsiyada jireed, taas oo la filayo. si loo yareeyo miisaanka super ultra-gaabanqalabka leysarka, laakiin waxay wanaajisaa saamaynta ay ku leedahay tijaabooyinka fiisigiska laser-ga sare.
Qalloocinta garaaca wadnaha ee hore ee laser ultrashort ultra-xoog leh
Si loo helo awoodda ugu sarreysa ee tamar xaddidan, ballaca garaaca garaaca waa la dhimay ilaa 20 ~ 30 femtose seconds iyadoo la kordhinayo xawaaraha faa'iidada. Tamarta garaaca wadnaha ee hadda 10-beak-watt ultra-gaaban laser waxay ku saabsan tahay 300 joules, iyo heerka dhaawaca hooseeya ee shabaqlaha kombaresarada ayaa ka dhigaysa daloolka iftiinka guud ahaan in ka badan 300 mm. Dhuxul garaaca wadnaha oo leh 20 ~ 30 femtosecond ballac garaaca wadnaha iyo 300 mm aperture waa sahlan tahay in la qaado qalloocinta isku dhafka ah ee spatiotemporal, gaar ahaan qalloocinta hore ee garaaca wadnaha. Jaantuska 1 (a) wuxuu muujinayaa kala-soocida boos-ku-meel-gaadhka ah ee hore ee garaaca wadnaha iyo wejiga hore ee ay sababtay kala firdhinta doorka beam, iyo kii hore wuxuu muujinayaa "meel-wareeg-ku-meel-gaar ah" marka loo eego kan dambe. Midda kale waa "curvature of space-time" kakan oo uu keeno nidaamka muraayadda. FIG 1 (b) waxay tusinaysaa saamaynta hore ee garaaca wadnaha ku haboon, hore ee garaaca wadnaha u janjeera iyo qalloocinta hore ee garaaca wadnaha-ku-meel-gaadhka ah ee goobta iftiinka ee bartilmaameedka. Natiijo ahaan, xoogga iftiinka xoogga leh ayaa si weyn loo dhimay, taas oo aan ku habboonayn codsiga goobta xooggan ee laser ultra-gaaban.
FIG 1 (a) leexashada hore ee garaaca wadnaha oo ay sababto prism iyo shabaggeedii, iyo (b) saamaynta qalloocinta hore ee garaaca wadnaha ee goobta iftiinka wakhtiga bannaan ee bartilmaameedka
Xawaaraha garaaca wadnaha ee aadka u xooganultrashort laser
Waqtigan xaadirka ah, alwaaxyada Bessel ee ay soo saareen superposition conical ee hirarka diyaaradda ayaa muujiyay qiimaha codsiga ee fiisigiska laysarka sare. Haddii laydhka garaaca wadnaha ee koonaysan uu leeyahay qaybinta hore ee garaaca wadnaha axisymmetric, markaa xoojinta xarunta joomatari ee xirmada hirarka raajo ee la sameeyay sida ku cad sawirka 2 waxay noqon kartaa superluminal joogto ah, subluminal joogto ah, superluminal la dedejiyay, iyo hoos u dhaca subluminal. Xataa isku dhafka muraayadaha qallafsan iyo modulator-ka nooca wejiga ah wuxuu soo saari karaa qaab-ku-meel-gaar ah oo aan caadi ahayn ee hore ee garaaca wadnaha, ka dibna wuxuu soo saaraa xawaaraha gudbinta ee la xakameyn karo. Saamaynta jireed ee kor ku xusan iyo tignoolajiyadeeda wax-ka-beddelka waxay u beddeli kartaa "qalloocin" hore ee garaaca wadnaha "xakamaynta" hore ee garaaca wadnaha, ka dibna xaqiijiso ujeedada beddelka xawaaraha gudbinta ee ultra-awood ultra-gaaban.
FIG 2 (a) Iftiinka joogtada ah ee ka dheereeya iftiinka, (b) iftiinka hoose ee joogtada ah, (c) la dedejiyey- ka-iftiin, iyo (d) garaaca iftiinka hoose ee hoos u dhacay ee ay dhaliso sarbeebtu waxay ku yaalaan xarunta joomatari ee gobolka sare
In kasta oo daah-furka qallooca hore ee garaaca wadnaha uu ka horreeyo laysarka ultra-gaaban, haddana waxa si weyn looga walaacay horumarinta leysarka ultra-gaaban. Muddo dheer, ma aha mid ku habboon xaqiijinta yoolka ugu muhiimsan ee laser ultra-gaaban - xoojinta iftiinka aadka u sarreeya, iyo cilmi-baarayaashu waxay ka shaqeynayeen sidii loo xakameyn lahaa ama loo baabi'in lahaa qalloocyada hore ee garaaca wadnaha. Maanta, markii "qalloocida hore ee garaaca wadnaha" uu u horumaray "kontaroolka hore ee garaaca wadnaha", waxay ku guulaysatay nidaaminta xawaaraha gudbinta ee laser-gaaban, oo siinaya habab cusub iyo fursado cusub oo loogu talagalay codsiga laser ultra-gaaban. fiisigiska laysarka sare.
Waqtiga boostada: Meey-13-2024