Qaybta koowaad ee gaarka ah ee laser-ka aadka u dheereeya

Gaar ahlaysar aad u dhakhso badanqaybta koowaad

Sifooyinka gaarka ah ee ultrafastlaysarka
Muddada garaaca aadka u gaaban ee laysarka aadka u degdega ah wuxuu siinayaa nidaamyadan sifooyin gaar ah oo ka soocaya laysarka garaaca dheer ama hirarka joogtada ah (CW). Si loo soo saaro garaaca gaaban, waxaa loo baahan yahay ballaca baaxadda ballaaran. Qaabka garaaca iyo hirarka dhexe ayaa go'aamiya ballaca ugu yar ee loo baahan yahay si loo soo saaro garaacyo muddo gaar ah. Caadiyan, xiriirkan waxaa lagu sharraxayaa marka la eego badeecada ballaca waqtiga (TBP), taas oo laga soo qaatay mabda'a hubanti la'aanta. TBP ee garaaca Gaussian waxaa lagu bixiyaa qaacidada soo socota:TBPGaussian=ΔτΔν≈0.441
Δτ waa muddada garaaca wadnaha iyo Δv waa baaxadda soo noqnoqoshada. Asal ahaan, isle'egtu waxay muujinaysaa in ay jirto xiriir liddi ku ah baaxadda gariiradda iyo muddada garaaca wadnaha, taasoo la macno ah in marka muddada garaaca wadnaha ay hoos u dhacdo, baaxadda loo baahan yahay si loo soo saaro garaaca wadnaha ayaa kordha. Jaantuska 1 wuxuu muujinayaa baaxadda ugu yar ee loo baahan yahay si loo taageero dhowr muddo oo garaacis kala duwan ah.

Jaantuska 1: Ballaca ugu yar ee muuqaalka ayaa loo baahan yahay si loo taageerogaraaca laysarkaoo ah 10 ps (cagaar), 500 fs (buluug), iyo 50 fs (casaan)

Caqabadaha farsamo ee laysarka aadka u dheereeya
Baaxadda ballaaran ee muuqaalka, awoodda ugu sarreysa, iyo muddada garaaca gaaban ee laysarka aadka u degdega ah waa in si habboon loogu maareeyaa nidaamkaaga. Badanaa, mid ka mid ah xalalka ugu fudud ee caqabadahan waa wax soo saarka ballaaran ee laysarka. Haddii aad hore u isticmaashay laysarka garaaca dheer ama hirarka joogtada ah, kaydkaaga jira ee qaybaha indhaha ayaa laga yaabaa inaysan awoodin inay ka tarjumayaan ama gudbiyaan baaxadda buuxda ee garaaca aadka u degdega ah.

Heerka waxyeelada laysarka
Optic-yada aadka u degdega ah sidoo kale waxay leeyihiin heerar aad u kala duwan oo aad u adag in lagu maareeyo heerarka waxyeelada laysarka (LDT) marka loo eego ilaha laysarka ee caadiga ah.laysarka nanosecond pulsed, qiimayaasha LDT badanaa waxay u dhexeeyaan 5-10 J/cm2. Aragtiyada aadka u dheereeya, qiimayaasha cabbirkan waa kuwo aan la maqlin, maadaama qiimayaasha LDT ay u badan tahay inay u dhigmaan <1 J/cm2, badanaa u dhow 0.3 J/cm2. Kala duwanaanshaha weyn ee baaxadda LDT ee muddada garaaca kala duwan waa natiijada habka dhaawaca laysarka ee ku salaysan muddada garaaca. Laydhadhka nanosecond ama ka dheer.laysarka garaaca leh, habka ugu weyn ee sababa burburka waa kuleylinta kulaylka. Qalabka dahaarka iyo substrate-kaaaladaha indhahanuugi fotonnada shilka oo kululee. Tani waxay keeni kartaa qallooc ku yimaada shabagga kiristaalka ee walaxda. Ballaarinta kulaylka, dildilaaca, dhalaalka iyo cadaadiska shabagga ayaa ah hababka waxyeelada kulaylka ee caadiga ah ee kuwanIlo laysar ah.

Si kastaba ha ahaatee, laysarka aadka u dheereeya, muddada garaaca laftiisu waa ka dhakhso badan tahay cabbirka wakhtiga wareejinta kulaylka laga bilaabo laysarka ilaa shabagga walxaha, sidaa darteed saameynta kuleylku maaha sababta ugu weyn ee dhaawaca uu keeno laysarka. Taa beddelkeeda, awoodda ugu sarreysa ee laysarka aadka u dheereeya wuxuu habka dhaawaca u beddelaa habab aan toosnayn sida nuugista badan ee photon iyo ionization. Tani waa sababta aysan suurtogal u ahayn in si fudud loo yareeyo qiimeynta LDT ee garaaca nanosecond ilaa kan garaaca aadka u dheereeya, sababtoo ah habka jireed ee dhaawaca wuu ka duwan yahay. Sidaa darteed, xaaladaha la midka ah ee isticmaalka (tusaale ahaan, hirarka, muddada garaaca, iyo heerka ku celcelinta), qalab indhaha ah oo leh qiimeyn LDT oo ku filan oo sare ayaa noqon doona qalabka indhaha ugu fiican ee codsigaaga gaarka ah. Optics-ka lagu tijaabiyay xaalado kala duwan ma matalaan waxqabadka dhabta ah ee isla optics-ka ee nidaamka.

Jaantuska 1: Hababka dhaawaca laysarka uu keeno oo leh muddooyin garaac oo kala duwan