Farxinta harmonics labaad ee spectrum ballaaran

Farxinta harmonics labaad ee spectrum ballaaran

Tan iyo markii la helay saamaynta labaad ee aan tooska ahayn ee 1960-meeyadii, waxay kicisay xiisaha ballaadhan ee cilmi-baarayaasha, illaa hadda, oo ku saleysan is-waafajinta labaad, iyo saameynta soo noqnoqda, waxay ka soo saartay ultraviolet-ka xad-dhaafka ah ilaa band infrared fog.leysarka, waxay si weyn kor ugu qaaday horumarinta laser;indhahahabaynta macluumaadka, sawir-qaadaha yar yar ee xallinta sare iyo qaybaha kale. Sida laga soo xigtay aan toos ahaynindhahaiyo aragtida polarization, xitaa-dalbashada saamaynta indho-indheynta aan tooska ahayn waxay si dhow ula xiriirtaa summaynta crystal, iyo isku-xidhka aan tooska ahayn maaha eber kaliya ee dhexdhexaadinta summeynta dhexdhexaadka ah. Sida saamaynta labaad ee aasaasiga ah ee asaasiga ah ee aan tooska ahayn, isku-dhafka labaad ayaa si weyn u xannibaya jiilkooda iyo isticmaalka waxtarka leh ee fiber quartz sababtoo ah qaabka amorphous iyo summetry ee leexinta xarunta. Waqtigan xaadirka ah, hababka polarization (polarization optical, polarization thermal, polarization field koronto) waxay si macmal ah u burburin karaan summetry xarunta walxaha ee fiber indhaha, waxayna si wax ku ool ah u wanaajisaa nidaamka labaad ee aan tooska ahayn ee fiber indhaha. Si kastaba ha ahaatee, habkani wuxuu u baahan yahay tignoolajiyada diyaarinta adag oo dalbanaysa, wuxuuna buuxin karaa oo keliya xaaladaha is-waafajinta ee wejiga ka-soo-baxa ah ee hirarka kala duwan. Giraanta resonant fiber indhaha ee ku salaysan qaabka gidaarka echo ayaa xaddidaya xiisaha baaxadda leh ee harmonics-ka labaad. Iyadoo la jebinayo summaynta qaab-dhismeedka dusha sare ee fiber-ka, dusha sare ee harmonics-ka labaad ee fiyuuska qaab-dhismeedka gaarka ah ayaa la wanaajiyey ilaa xad, laakiin wali waxay ku xiran tahay garaaca garaaca femtosecond oo leh awood aad u sarreeya. Sidaa darteed, jiilka labaad ee saamaynta indho-indheynta aan tooska ahayn ee dhammaan qaab-dhismeedka fiber-ka iyo hagaajinta waxtarka beddelka, gaar ahaan jiilka harmonics-ka labaad ee ballaaran ee awoodda hoose, bamgareynta joogtada ah ee indhaha, waa dhibaatooyinka aasaasiga ah ee u baahan in lagu xalliyo berrinka fiber optics iyo qalabka, waxayna leeyihiin muhiimad cilmiyeed oo muhiim ah iyo qiimaha codsiga ballaaran.

Koox cilmi baaris ah oo ku sugan Shiinaha ayaa soo jeediyay nidaam isku dhafan oo gallium selenide crystal waji ah oo leh fiber-nano-yar. Adigoo ka faa'iideysanaya nidaamka sare ee labaad ee aan tooska ahayn iyo dalbashada muddada dheer ee gallium selenide crystals, kicinta ballaaran ee labaad ee harmonic iyo habka beddelka ee isdaba-joogga ah ayaa la xaqiiqsaday, iyadoo la siinayo xal cusub oo loogu talagalay horumarinta hababka kala duwan ee fiber-ka iyo diyaarinta ballaaran ee labaad-harmonic.ilaha iftiinka. Xamaasadda hufan ee is-waafajinta labaad iyo isku-darka saameynta soo noqnoqda ee nidaamka waxay inta badan ku xiran tahay saddexda xaaladood ee muhiimka ah: masaafada isdhexgalka iftiinka-dheer ee u dhexeeya gallium selenide iyomicro-nano fiber, Nidaamka sare ee labaad ee aan tooska ahayn iyo nidaamka dhererka dheer ee lakabka gallium selenide crystal, iyo marxaladaha u dhigma xaaladaha aasaasiga ah ee soo noqnoqoshada asaasiga ah iyo inta jeer ee habka labalaabista ayaa ku qanacsan.

Tijaabada, fiber-nano-yar oo ay diyaarisay nidaamka xarkaha sawirka ololka ayaa leh gobolka koontada isku midka ah ee nidaamka milimitirka, kaas oo bixiya dhererka ficilka dheer ee aan tooska ahayn ee iftiinka bamka iyo mawjada labaad ee iswaafajinta. Dalab-labaad ee aan tooska ahayn ee polarizability-ga isku-dhafan ee gallium selenide crystal wuxuu dhaafaa 170 pm/V, kaas oo aad uga sareeya polarizability-ga aan tooska ahayn ee fibre-aragga. Waxaa intaa dheer, qaab dhismeedka dheer ee la amray ee gallium selenide crystal wuxuu hubinayaa faragelinta joogtada ah ee wejiga labaad ee harmonics, siinta ciyaar buuxda si ay uga faa'iideysato dhererka ficilka weyn ee aan tooska ahayn ee fiilada micro-nano. Waxaa ka sii muhiimsan, wejiga u dhigma inta u dhaxaysa habka saldhigga indhaha ee bamgareynta (HE11) iyo habka labaad ee nidaamka sare ee harmonic (EH11, HE31) waxaa lagu gartaa iyada oo la xakameynayo dhexroorka koontada ka dibna nidaaminaya fidinta waveguide inta lagu jiro diyaarinta fiber micro-nano.

Shuruudaha kor ku xusan waxay aasaas u yihiin firfircoonida waxtarka leh iyo xiisaha ballaaran ee harmonics-ka labaad ee fiber-nano. Tijaabada ayaa muujineysa in wax soo saarka harmonics labaad ee heerka nanowatt lagu gaari karo hoos 1550 nm picosecond garaaca laser bamka, iyo harmonics labaad sidoo kale waxaa lagu farxi karaa si hufan hoos bamka laser joogto ah oo la mid ah mawjadda la mid ah, iyo awoodda xadka waa sida hoose sida dhowr boqol oo microwatts (Jaantuska 1). Dheeraad ah, marka nalka bamka la kordhiyo ilaa saddex mawjadaha kala duwan ee laser joogto ah (1270/1550/1590 nm), saddex harmonics labaad (2w1, 2w2, 2w3) iyo saddex wadarta calaamadaha soo noqnoqda (w1 + w2, w1 + w3, w2 + w3) ayaa lagu arkay mid kasta oo ka mid ah lix wareeg beddelka mawjada. Iyada oo lagu beddelayo iftiinka bamka leh diode ultra-radiant light-emitting diode (SLED) il iftiin leh oo leh xajmi dhan 79.3 nm, iswaafajin ballaadhan oo labaad oo leh xajmiga 28.3 nm ayaa la soo saarayaa (Jaantuska 2). Intaa waxaa dheer, haddii tikniyoolajiyadda kaydinta uumiga kiimikada loo isticmaali karo in lagu beddelo tignoolajiyada wareejinta qalalan ee daraasaddan, iyo lakabyo yar oo ka samaysan gallium selenide crystals ayaa lagu kori karaa dusha sare ee fiber micro-nano masaafo dheer, waxtarka beddelka labaad ee iswaafajinta ayaa la filayaa in la sii wanaajiyo.

FIG 1 Habka jiilka labaad ee wada noolaanshaha iyo natiijooyinka qaab dhismeedka fiber-dhan

Jaantuska 2 Isku-dhafka mowjadaha-mawjadaha badan iyo harmonics-ka labaad ee ballaaran ee hoos yimaada bamgareynta indhaha ee joogtada ah