Qaybta koowaad ee laser ultrafast gaar ah

Gaar ahlaser ultrafastqaybta koowaad

Guryaha gaarka ah ee ultrafastleysarka
Muddada garaaca wadnaha ultra-gaaban ee ultrafast lasers ayaa siinaya nidaamyadan sifooyin gaar ah oo ka sooca laysarka garaaca dheer ama joogtada ah (CW). Si loo dhaliyo garaaca garaaca gaaban ee noocan oo kale ah, bandwidth ballaaran ayaa loo baahan yahay. Qaabka garaaca wadnaha iyo dhererka hirarka dhexe ayaa go'aamiya xawaaraha xawaaraha ugu yar ee loo baahan yahay si loo dhaliyo garaacyada waqti gaar ah. Caadi ahaan, xiriirkan waxaa lagu sifeeyaa marka la eego badeecada waqtiga-bandwidth-ka (TBP), kaas oo laga soo qaatay mabda'a aan la hubin. TBP ee garaaca wadnaha Gaussian waxaa lagu bixiyaa qaacidada soo socota:TBPGaussian=ΔτΔν≈0.441
Δτ waa muddada garaaca wadnaha iyo Δv waa xajmiga inta jeer ee. Nuxur ahaan, isla'egta ayaa muujinaysa in uu jiro xiriir aan leexleexad lahayn oo u dhexeeya xajmiga xajmiga iyo muddada garaaca wadnaha, taas oo macnaheedu yahay in muddada garaaca wadnaha uu hoos u dhaco, xajmiga loo baahan yahay si loo dhaliyo garaaca wadnaha ayaa kordha. Jaantuska 1 waxa uu muujinayaa xadka ugu yar ee loo baahan yahay si uu u taageero dhawr jeer oo kala duwan oo garaaca wadnaha ah.

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

Caqabadaha farsamada ee laser ultrafast
Xajmiga baaxadda ballaadhan ee baaxadda leh, awoodda ugu sarreysa, iyo muddada garaaca garaaca gaaban ee laysarka ultrafast waa in si habboon loogu maareeyaa nidaamkaaga. Inta badan, mid ka mid ah xalalka ugu fudud ee caqabadahan waa wax soo saarka spectrum ballaaran ee lasers. Haddii aad hore u isticmaashay garaaca garaaca wadnaha dheer ama mawjada joogtada ah ee leysarka, kaydkaada hadda jira ee qaybaha indhaha ayaa laga yaabaa inay awoodi waayaan inay ka turjumaan ama gudbiyaan xawaaraha buuxa ee garaaca wadnaha ultrafast.

Heerka waxyeelada leysarka
Ultrafast optics sidoo kale aad bay u kala duwan yihiin oo aad bay u adag tahay in lagu dhex maro marinnada waxyeelada laysarka (LDT) marka la barbar dhigo ilo laysarka caadiga ah. Marka muuqaalada la bixiyonanoscond pulsed lasers, Qiimayaasha LDT waxay badiyaa u kala horeeyaan 5-10 J/cm2. Xagga indhaha ultrafast, qiyamka baaxaddan ayaa ah mid aan la maqlin, maadaama qiyamka LDT ay aad ugu dhow yihiin inay u kala horreeyaan <1 J/cm2, badiyaa u dhow 0.3 J/cm2. Kala duwanaanshaha weyn ee baaxadda LDT ee hoos yimaada muddada garaaca wadnaha ee kala duwan ayaa ah natiijada habka dhaawaca laysarka ee ku salaysan muddada garaaca wadnaha. Laysarka nanosecond ama ka dheerleysarka garaaca, habka ugu muhiimsan ee waxyeellada keena waa kulaylka kulaylka. Dahaarka iyo qalabka substrate eeqalabka indhahanuugo sawirada dhacdada oo diiri. Tani waxay u horseedi kartaa qallooc ku yimaadda shabagga crystal walxaha. Balaadhinta kulaylka, dildilaaca, dhalaalka iyo culayska daahyada ayaa ah hababka waxyeellada kulaylka ee caadiga ah ee kuwanilaha laysarka.

Si kastaba ha noqotee, laysarka ultrafast, muddada garaaca wadnaha lafteedu way ka dhakhso badan tahay qiyaasta wakhtiga kulaylka ee ka soo wareejinta laysarka ilaa qalabka wax-soo-saarka, markaa saamaynta kulaylku maaha sababta ugu weyn ee waxyeellada laser-ka. Taa baddalkeeda, awoodda ugu sarreysa ee laser ultrafast waxay u beddeshaa habka waxyeellada ee hababka aan tooska ahayn sida nuugista sawir-qaadista badan iyo ionization. Tani waa sababta aysan suurtagal ahayn in si fudud loo yareeyo qiimeynta LDT ee garaaca nanosecond ee garaaca wadnaha ultrafast, sababtoo ah habka jireed ee dhaawacu waa ka duwan yahay. Sidaa darteed, isla shuruudaha isticmaalka (tusaale, hirarka dhererka, muddada garaaca wadnaha, iyo heerka soo noqnoqda), aaladda indhaha ee leh qiimaynta LDT oo ku filan ayaa noqon doonta aaladda indhaha ee ugu fiican ee codsigaaga gaarka ah. Optics-yada lagu tijaabiyay xaalado kala duwan maaha kuwo matala waxqabadka dhabta ah ee isla muraayadaha nidaamka.

Jaantus 1: Hababka laysarka waxyeelada ay keento oo leh waqtiyo garaaca wadnaha oo kala duwan