Laser garaacis heer sare ah oo ku celcelin ah

Laser garaacis heer sare ah oo ku celcelin ah

Dunida yar yar ee isdhexgalka iftiinka iyo walxaha, garaaca heerka ku celcelinta aadka u sarreeya (UHRPs) waxay u dhaqmaan sidii kuwa saxda ah ee waqtiga - waxay ku wareegaan in ka badan hal bilyan jeer ilbiriqsigii (1GHz), iyagoo qabanaya faraha molecular-ka ee unugyada kansarka ee sawir-qaadista muuqaalka, iyagoo wata xaddi badan oo xog ah oo ku jira isgaarsiinta fiber-ka indhaha, iyo hagaajinta isku-duwayaasha hirarka xiddigaha ee teleskoobyada. Gaar ahaan boodboodka cabbirka ogaanshaha ee lidar, terahertz ultra-high repeat rate pulsed pulsed rate (100-300 GHz) waxay noqonayaan qalab awood leh si ay u galaan lakabka faragelinta, iyagoo dib u qaabaynaya xuduudaha aragtida saddex-cabbir leh awoodda maaraynta booska ee heerka photon. Waqtigan xaadirka ah, isticmaalka qaab-dhismeedka macmalka ah, sida godadka micro-ring ee u baahan saxnaanta farsamaynta nanoscale si loo soo saaro isku-darka afar-hir (FWM), waa mid ka mid ah hababka ugu muhiimsan ee lagu helo garaaca indhaha ee heerka ku celcelinta aadka u sarreeya. Saynisyahannadu waxay diiradda saarayaan xallinta dhibaatooyinka injineernimada ee habaynta qaab-dhismeedka aadka u fiican, dhibaatada hagaajinta soo noqnoqoshada inta lagu jiro bilowga garaaca wadnaha, iyo dhibaatada hufnaanta beddelka ka dib soo saarista garaaca wadnaha. Hab kale ayaa ah in la isticmaalo fiilooyin aan toos ahayn oo la isticmaalo saamaynta xasilloonida isbeddelka ama saameynta FWM ee gudaha godka laysarka si loo kiciyo UHRPs. Ilaa hadda, waxaan weli u baahanahay "qaabeeye waqti" oo aad u firfircoon.

Habka loo soo saaro UHRP iyadoo la isku duro garaacyo aad u dhakhso badan si loo kiciyo saameynta FWM ee kala firdhisa waxaa lagu qeexaa "dab-shid aad u dhakhso badan". Si ka duwan nidaamka daloolada microring-ka ee aan kor ku soo sheegnay ee u baahan bamgareyn joogto ah, hagaajin sax ah oo ku saabsan kala-goynta si loo xakameeyo soo saarista garaaca wadnaha, iyo isticmaalka warbaahinta aadka u aan toosanayn si loo yareeyo heerka FWM, "dab-shidkan" wuxuu ku tiirsan yahay astaamaha awoodda ugu sarreysa ee garaacyada aadka u degdega ah si toos ah loogu kiciyo FWM, ka dib "dab-shidka", lagu gaaro UHRP is-waafajinaya.

Jaantuska 1aad wuxuu muujinayaa habka ugu muhiimsan ee lagu gaaro is-abaabulka garaaca wadnaha iyadoo lagu saleynayo kicinta garaaca abuurka ee aadka u degdega ah ee godadka giraanta fiilada kala firdhisa. Garaaca abuurka ee ultrashort ee dibadda lagu duray (xilliga T0, soo noqnoqoshada ku celcelinta F) wuxuu u adeegaa sidii "isha dabka" si uu u kiciyo goob garaaca wadnaha oo awood sare leh oo ku jirta godka kala firdhista. Module-ka faa'iidada gudaha wuxuu u shaqeeyaa si isku mid ah oo leh qaabeeyaha spectral si uu tamarta garaaca abuurka ugu beddelo jawaab muuqaal shanlo leh iyada oo loo marayo nidaaminta wadajirka ah ee qaybta soo noqnoqoshada waqtiga. Habkani wuxuu jebiyaa xaddidaadaha bamka joogtada ah ee dhaqameed: garaaca abuurka wuu xidhmaa marka uu gaaro heerka FWM ee kala firdhista, godka kala firdhisana wuxuu ilaaliyaa xaaladda is-abaabulka ee garaaca wadnaha iyada oo loo marayo dheelitirka firfircoon ee faa'iidada iyo khasaaraha, iyadoo soo noqnoqoshada ku celcelinta garaaca wadnaha ay tahay Fs (oo u dhiganta FF ee gudaha iyo muddada T ee godka).

Daraasaddani waxay sidoo kale samaysay xaqiijin aragtiyeed. Iyada oo ku saleysan xuduudaha lagu qaatay dejinta tijaabada iyo 1pslaser garaaca wadnaha oo aad u dhakhso badanMarkii hore, jilitaanka tirooyinka ayaa lagu sameeyay habka horumarka ee goobta waqtiga garaaca wadnaha iyo soo noqnoqoshada gudaha godka laysarka. Waxaa la ogaaday in garaaca wadnaha uu soo maray saddex marxaladood: kala qaybsanaanta garaaca wadnaha, gariirka garaaca wadnaha ee xilliyeedka, iyo qaybinta isku midka ah ee garaaca wadnaha oo dhan godka laysarka. Natiijadan tirooyinka ah waxay sidoo kale si buuxda u xaqiijinaysaa astaamaha is-abaabulka eelaysarka garaaca wadnaha.

Iyadoo la kicinayo saameynta isku-darka afar-hir ee gudaha godka giraanta fiilada kala firdhisa iyada oo loo marayo dab-shididda garaaca abuurka ee aadka u degdega ah, jiilka is-abaabulka iyo dayactirka garaaca soo noqnoqda ee hoos-THZ ee aadka u sarreeya (wax soo saar deggan oo ah awood 0.5W ka dib marka la damiyo abuurka) ayaa si guul leh loo gaaray, taasoo bixinaysa nooc cusub oo il iftiin ah oo loogu talagalay goobta lidar: Dib-u-soo-celinta heerka hoose ee THZ waxay kor u qaadi kartaa xallinta daruurta dhibicda ilaa heerka milimitirka. Sifada is-waafajinta garaaca si weyn ayay u yareysaa isticmaalka tamarta nidaamka. Qaab-dhismeedka dhammaan-faybarku wuxuu hubiyaa hawlgal xasilloon oo sare oo ku jira xarigga badbaadada indhaha ee 1.5 μm. Marka la eego mustaqbalka, tignoolajiyadani waxaa la filayaa inay horseeddo horumarka lidar-ka ku rakiban gaariga una gudubta yaraynta (oo ku salaysan shaandheeyayaasha yaryar ee MZI) iyo ogaanshaha masaafada dheer (ballaarinta awoodda ilaa > 1W), iyo si dheeraad ah ula qabsiga shuruudaha aragtida ee deegaannada adag iyada oo loo marayo dab-shid isku-dubarid badan oo hirarka ah iyo nidaaminta caqliga leh.